Commit Graph

1125 Commits

Author SHA1 Message Date
Norman Maurer
ade60c11e1
PlatformDependent0 should be able to better detect if unaligned access is supported on java9 and later. (#8255)
Motivation:

In Java8 and earlier we used reflection to detect if unaligned access is supported. This fails in Java9 and later as we would need to change the accessible level of the method.
Lucky enough we can use Unsafe directly to read the content of the static field here.

Modifications:

Add special handling for detecting if unaligned access is supported on Java9 and later which does not fail due jigsaw.

Result:

Better and more correct detection on Java9 and later.
2018-09-05 07:22:16 +02:00
Norman Maurer
3eec66a974
Do not fail on runtime when an older version of Log4J2 is on the classpath. (#8240)
Motivation:

At the moment we will just assume the correct version of log4j2 is used when we find it on the classpath. This may lead to an AbstractMethodError at runtime. We should not use log4j2 if the version is not correct.

Modifications:

Check on class loading if we can use Log4J2 or not.

Result:

Fixes #8217.
2018-09-03 18:07:53 +02:00
Norman Maurer
9d8846cfce
Cleanup Log4J2Logger (#8245)
Motivation:

Log4J2Logger had some code-duplication with AbstractInternalLogger

Modifications:

Reuse AbstractInternaLogger.EXCEPTION_MESSAGE in Log4J2Logger and so remove some code-duplication

Result:

Less duplicated code.
2018-08-31 17:08:38 +02:00
Norman Maurer
38eee409c8
We should be able to use the ByteBuffer cleaner on java8 (and earlier… (#8234)
* We should be able to use the ByteBuffer cleaner on java8 (and earlier versions) even if sun.misc.Unsafe is not present.

Motivation:

At the moment we have a hard dependency on sun.misc.Unsafe to use the Cleaner on Java8 and earlier. This is not really needed as we can still use pure reflection if sun.misc.Unsafe is not present.

Modifications:

Refactor Cleaner6 to fallback to pure reflection if sun.misc.Unsafe is not present on system.

Result:

More timely releasing of direct memory on Java8 and earlier when sun.misc.Unsafe is not present.
2018-08-30 07:43:10 +02:00
Norman Maurer
4a5b61fc13
Fix log message about using non-direct buffers by default (#8235)
Motivation:

f77891cc17 changed slightly how we detect if we should prefer direct buffers or not but did miss to also take this into account when logging.

Modifications:

Fix branch for log message to reflect changes in f77891cc17.

Result:

Correct logging.
2018-08-30 06:57:12 +02:00
Terence Yim
79706357c7 Fix race condition in the NonStickyEventExecutorGroup (#8232)
Motivation:

There was a race condition between the task submitter and task executor threads such that the last Runnable submitted may not get executed. 

Modifications:

The bug was fixed by checking the task queue and state in the task executor thread after it saw the task queue was empty.

Result:

Fixes #8230
2018-08-29 19:42:01 +02:00
Norman Maurer
f77891cc17
We should prefer direct buffers if we can access the cleaner even if sun.misc.Unsafe is not present. (#8233)
Motivation:

We should prefer direct buffers whenever we can use the cleaner even if sun.misc.Unsafe is not present.

Modifications:

Correctly prefer direct buffers in all cases.

Result:

More correct code.
2018-08-29 08:21:07 +02:00
Norman Maurer
8679c5ef43
CleanerJava9 should be able to do its job even with a SecurityManager installed. (#8204)
Motivation:

CleanerJava9 currently fails whever a SecurityManager is installed. We should make use of AccessController.doPrivileged(...) so the user can give it the correct rights.

Modifications:

Use doPrivileged(...) when needed.

Result:

Fixes https://github.com/netty/netty/issues/8201.
2018-08-28 16:32:29 +02:00
zhaojigang
338ef96931 Recycler will produce npe error when multiple recycled at different thread
Motivation:

Recycler may produce a NPE when the same object is recycled multiple times from different threads.

Modifications:

- Check if the id has changed or if the Stack became null and if so throw an IllegalStateException
- Add unit test

Result:

Fixes https://github.com/netty/netty/issues/8220.
2018-08-27 08:58:40 +02:00
root
a580dc7585 [maven-release-plugin] prepare for next development iteration 2018-08-24 06:36:33 +00:00
root
3fc789e83f [maven-release-plugin] prepare release netty-4.1.29.Final 2018-08-24 06:36:06 +00:00
Norman Maurer
2bb9f64e16
Try to monkey-patch library id when shading is used and we are on Mac… (#8210)
* Try to monkey-patch library id when shading is used and we are on MacOS / OSX.

Motivation:

ea4c315b45 did ensure we support using multiple versions of the same shaded native library but the user still needed to run install_name_tool -id on MacOS to ensure the ID is unique.
This is kind of error prone and also means that the shading itself would need to be done on MacOS / OSX.

This is related to https://github.com/netty/netty/issues/7272.

Modifications:

- Monkey patch the shaded native lib on MacOS to ensure the id is unique while unpacking it to the tempory location.

Result:

Easier way of using shaded native libs in netty.
2018-08-23 11:07:09 +02:00
Norman Maurer
182ffdaf6d
Only use manual safepoint polling in PlatformDependent0.copyMemory(...) when using java <= 8 (#8124)
Motivation:

Java9 and later does the safepoint polling by itself so there is not need for us to do it.

Modifications:

Check for java version before doing manual safepoint polling.

Result:

Less custom code and less overhead when using java9 and later. Fixes https://github.com/netty/netty/issues/8122.
2018-08-18 21:09:18 +02:00
Ziyan Mo
785473788f (Nio|Epoll)EventLoop.pendingTasks does not need to dispatch to the EventLoop (#8197)
Motivation:

EventLoop.pendingTasks should be (reasonably) cheap to invoke so it can be used within observability. 

Modifications:

Remove code that dispatch access to the internal taskqueue to the EventLoop when invoked as this is not needed anymore with the current MPSC queues we are using. 

See https://github.com/netty/netty/issues/8196#issuecomment-413653286.

Result:

Fixes https://github.com/netty/netty/issues/8196
2018-08-18 07:28:31 +02:00
root
fcb19cb589 [maven-release-plugin] prepare for next development iteration 2018-07-27 04:59:28 +00:00
root
ff785fbe39 [maven-release-plugin] prepare release netty-4.1.28.Final 2018-07-27 04:59:06 +00:00
Norman Maurer
0dc71cee3a
DefaultPromise.getNow() does not correctly handle DefaultPromise.setUncancellable() (#8154)
Motivation:

We do not correctly check for previous calles of setUncancellable() in getNow() which may result in ClassCastException as we incorrectly return the internally UNCANCELLABLE object and not null if setUncancellable() we as called before.

Modifications:

Correctly check for UNCANCELLABLE and add unit test.

Result:

Fixes https://github.com/netty/netty/issues/8135.
2018-07-27 01:55:21 +08:00
root
b4dbdc2036 [maven-release-plugin] prepare for next development iteration 2018-07-11 15:37:40 +00:00
root
1c16519ac8 [maven-release-plugin] prepare release netty-4.1.27.Final 2018-07-11 15:37:21 +00:00
Norman Maurer
8186c9aaea
Fix length calculation in AsciiString.indexOf(...) and so eliminate ArrayIndexOutOfBoundsException. (#8116)
Motivation:

We incorrectly calculated the length that was used for our for loop in AsciiString.indexOf(...). This lead to a possible ArrayIndexOutOfBoundsException.

Modifications:

- Not include the start in the length calculation
- Add unit test.

Result:

Fixes https://github.com/netty/netty/issues/8112.
2018-07-11 10:21:17 +01:00
Norman Maurer
93d2807ff0
Auto-detect Log4J2 for logging if on the class-path (#8109)
Motivation:

https://github.com/netty/netty/pull/5047 added Log4J2 support but missed to add code to try to auto-detect it.

Modifications:

Try to use Log4JLoggerFactory by default.

Result:

Fixes https://github.com/netty/netty/issues/8107.
2018-07-11 10:19:37 +01:00
root
7bb9e7eafe [maven-release-plugin] prepare for next development iteration 2018-07-10 05:21:24 +00:00
root
8ca5421bd2 [maven-release-plugin] prepare release netty-4.1.26.Final 2018-07-10 05:18:13 +00:00
Sebastian Utz
0920738932 Do not log explicit no unsafe, fixes helper method. (#8111)
Motivation:

Users should not see a scary log message when Netty is initialized if
Netty configuration explicitly disables unsafe. The log message that
produces this warning was previously guarded but by recent refactoring
a bug was introduced inside the guard helper method.

Modifications:

This commit brings back the guard against the scary log message if
unsafe is explicitly disabled.

Result:

No log message is produced when unsafe is unavailable because Netty was
told to not look for it.

Relates https://github.com/netty/netty/pull/5624, https://github.com/netty/netty/pull/6696
2018-07-09 15:57:35 -04:00
Norman Maurer
83710cb2e1
Replace toArray(new T[size]) with toArray(new T[0]) to eliminate zero-out and allow the VM to optimize. (#8075)
Motivation:

Using toArray(new T[0]) is usually the faster aproach these days. We should use it.

See also https://shipilev.net/blog/2016/arrays-wisdom-ancients/#_conclusion.

Modifications:

Replace toArray(new T[size]) with toArray(new T[0]).

Result:

Faster code.
2018-06-29 07:56:04 +02:00
Norman Maurer
5b1fe611a6
Remove usage of ObjectCleaner (#8064)
Motivation:

ObjectCleaner does start a Thread to handle the cleaning of resources which leaks into the users application. We should not use it in netty itself to make things more predictable.

Modifications:

- Remove usage of ObjectCleaner and use finalize as a replacement when possible.
- Clarify javadocs for FastThreadLocal.onRemoval(...) to ensure its clear that remove() is not guaranteed to be called when the Thread completees and so this method is not enough to guarantee cleanup for this case.

Result:

Fixes https://github.com/netty/netty/issues/8017.
2018-06-28 08:15:27 +02:00
nickhill
06f3574e46 Don't calculate max direct memory twice in PlatformDependent
Motivation:

I'm not sure if trivial changes like this are interesting :-) But I
noticed that the PlatformDependent.maxDirectMemory0() method is called
twice unnecessarily during static initialization (on the default path at
least).

Modifications:

Use constant MAX_DIRECT_MEMORY already set to the same value instead of
calling maxDirectMemory0() again.

Result:

A surely imperceivable reduction in operations performed at startup.
2018-06-26 13:58:54 +02:00
Roger
3e3e5155b9 Check if Log level is enabled before creating log statements (#8022)
Motivation

There is a cost to concatenating strings and calling methods that will be wasted if the Logger's level is not enabled.

Modifications

Check if Log level is enabled before producing log statement. These are just a few cases found by RegEx'ing in the code.

Result

Tiny bit more efficient code.
2018-06-13 23:21:53 -07:00
Norman Maurer
d133bf06a4
Allow to schedule tasks up to Long.MAX_VALUE (#7972)
Motivation:

We should allow to schedule tasks with a delay up to Long.MAX_VALUE as we did pre 4.1.25.Final.

Modifications:

Just ensure we not overflow and put the correct max limits in place when schedule a timer. At worse we will get a wakeup to early and then schedule a new timeout.

Result:

Fixes https://github.com/netty/netty/issues/7970.
2018-05-30 11:11:42 +02:00
Norman Maurer
8a85761500
Don't use VM.maxDirectMemory() on IBM J9 / Eclipse OpenJ9 to retrieve direct memory limit (#7966)
Motivation:

On J9 / OpenJ9 netty initializes this value with 64M, even the direct accessible memory is actually unbounded.

Modifications:

Skip usage of VM.maxDirectMemory() on J9 / OpenJ9

Result:

More correct direct memory limit detection. Fixes #7654.
2018-05-25 14:35:32 +02:00
Norman Maurer
c3d29f7b9e
Guard against calling malloc(0) when create ByteBuffer. (#7948)
Motivation:

We did not guard against the case of calling malloc(0) when creating a ByteBuffer without a Cleaner. The problem is that malloc(0) can have different behaviour, it either return a null-pointer or a valid pointer that you can pass to free.

The real problem arise if Unsafe.allocateMemory(0) returns 0 and we use it as the memoryAddress of the ByteBuffer. The problem here is that native libraries test for 0 and handle it as a null-ptr. This is for example true in SSL.bioSetByteBuffer(...) which would throw a NPE when 0 is used as memoryAddress and so produced errors during SSL usage.

Modifications:

- Always allocate 1 byte as minimum (even if we ask for an empty buffer).
- Add unit test.

Result:

No more errors possible because of malloc(0).
2018-05-17 06:55:48 +02:00
Norman Maurer
64bb279f47 [maven-release-plugin] prepare for next development iteration 2018-05-14 11:11:45 +00:00
Norman Maurer
c67a3b0507 [maven-release-plugin] prepare release netty-4.1.25.Final 2018-05-14 11:11:24 +00:00
Xiaoyan Lin
a0ed6ec06c Fix the error message in ReferenceCounted.release (#7921)
Motivation:

When a buffer is over-released, the current error message of `IllegalReferenceCountException` is `refCnt: XXX, increment: XXX`, which is confusing. The correct message should be `refCnt: XXX, decrement: XXX`.

Modifications:

Pass `-decrement` to create `IllegalReferenceCountException`.

Result:

The error message will be `refCnt: XXX, decrement: XXX` when a buffer is over-released.
2018-05-08 20:09:16 +02:00
Norman Maurer
eaf1771336
Don't use VM.maxDirectMemory() on z/OS to retrieve direct memory limit. (#7886)
Motivation:

On z/OS netty initializes this value with 64M, even the direct accessible memory is actually unbounded.

Modifications:

Skip usage of VM.maxDirectMemory() on z/OS.

Result:

More correct direct memory limit detection. Fixes https://github.com/netty/netty/issues/7654.
2018-04-25 07:33:07 +02:00
Norman Maurer
b47fb81799
EventLoop.schedule with big delay fails (#7402)
Motivation:

Using a very huge delay when calling schedule(...) may cause an Selector error when calling select(...) later on. We should gaurd against such a big value.

Modifications:

- Add guard against a very huge value.
- Added tests.

Result:

Fixes [#7365]
2018-04-24 11:15:20 +02:00
Robin Wang
010dbe3c73 Optimize space usage of FastThreadLocal (#7861)
Motivation:
A FastThreadLocal instance currently occupies 2 slots of InternalThreadLocalMap of every thread. Actually for a FastThreadLocalThread, it does not need to store cleaner flags of FastThreadLocal instances. Besides, using BitSet to store cleaner flags is also better for space usage.

Modification:
Use BitSet to optimize space usage of FastThreadLocal.

Result:
Avoid unnecessary slot occupancy. Cleaner flags are now stored into a BitSet.
2018-04-24 09:19:01 +02:00
Norman Maurer
b75f44db9a [maven-release-plugin] prepare for next development iteration 2018-04-19 11:56:07 +00:00
Norman Maurer
04fac00c8c [maven-release-plugin] prepare release netty-4.1.24.Final 2018-04-19 11:55:47 +00:00
Norman Maurer
3ec29455af
Fix eternal loop in Recycler.WeakOrderQueue.Head#run() that blocks ObjectCleaner thread (#7878)
Motivation:

When trying to cleanup WeakOrderQueue by the ObjectCleaner we end up in an endless loop which will cause the ObjectCleaner to be not able to cleanup any other resources anymore.This bug was introduced by 6eb9674bf5.

Modifications:

Correctly update link while cleanup

Result:

Fixes https://github.com/netty/netty/issues/7877
2018-04-19 09:40:38 +02:00
Scott Mitchell
3f244a94fe
AsciiString#indexOf out of bounds (#7866)
Motivation:
The bounds checking for AsciiString#indexOf and AsciiString#lastIndexOf is not correct and may lead to ArrayIndexOutOfBoundsException.

Modifications:
- Correct the bounds checking for AsciiString#indexOf and AsciiString#lastIndexOf

Result
Fixes https://github.com/netty/netty/issues/7863
2018-04-12 12:06:12 -07:00
Gustavo Fernandes
76c5f6cd03 Enable per origin Cors configuration (#7800)
Motivation:

Finer granularity when configuring CorsHandler, enabling different policies for different origins.

Modifications:

The CorsHandler has an extra constructor that accepts a List<CorsConfig> that are evaluated sequentially when processing a Cors request

Result:

The changes don't break backwards compatibility. The extra ctor can be used to provide more than one CorsConfig object.
2018-04-11 10:06:13 +02:00
Norman Maurer
5ab8342798
Add dev-tools dependency for commons (#7858)
Motivation:

We need to add a dev-tools dependecy for commons as otherwise we may fail to fetch it before we try to use it.

Modifications:

Add dependency.

Result:

Fixes https://github.com/netty/netty/issues/7842
2018-04-10 10:37:02 +02:00
Dave Moten
0f4001d598 add task before starting thread in SingleThreadEventExecutor.execute (#7841)
Motivation:

Minor performance optimisation that prevents thread from blocking due to task not having been added to queue. Discussed #7815.

Modification:

add task to the queue before starting the thread.

Result:

No additional tests.
2018-04-05 07:57:21 +02:00
root
0a61f055f5 [maven-release-plugin] prepare for next development iteration 2018-04-04 10:44:46 +00:00
root
8c549bad38 [maven-release-plugin] prepare release netty-4.1.23.Final 2018-04-04 10:44:15 +00:00
Scott Mitchell
602ee5444d NetUtil valid IP methods to accept CharSequence (#7827)
* NetUtil valid IP methods to accept CharSequence

Motivation:
NetUtil has methods to determine if a String is a valid IP address. These methods don't rely upon String specific methods and can use CharSequence instead.

Modifications:
- Use CharSequence instead of String for the IP validator methods.
- Avoid object allocation in AsciiString#indexOf(char,int) and reduce
byte code

Result:
No more copy operation required if a CharSequence exists.
2018-04-01 08:39:43 +02:00
Stephane Landelle
d60cd0231d HttpProxyHandler generates invalid CONNECT url and Host header when address is resolved
Motivation:

HttpProxyHandler uses `NetUtil#toSocketAddressString` to compute
CONNECT url and Host header.

The url is correct when the address is unresolved, as
`NetUtil#toSocketAddressString` will then use
`getHoststring`/`getHostname`. If the address is already resolved, the
url will be based on the IP instead of the hostname.

There’s an additional minor issue with the Host header: default port
443 should be omitted.

Modifications:

* Introduce NetUtil#getHostname
* Introduce HttpUtil#formatHostnameForHttp to format an
InetSocketAddress to
HTTP format
* Change url computation to favor hostname instead of IP
* Introduce HttpProxyHandler ignoreDefaultPortsInConnectHostHeader
parameter to ignore 80 and 443 ports in Host header

Result:

HttpProxyHandler performs properly when connecting to a resolved address
2018-03-27 09:43:11 +02:00
Norman Maurer
de082bf4c7 Correctly record creation stacktrace in ResourceLeakDetector.
Motivation:

We missed to correctly record the stacktrace of the creation of an ResourceLeak record. This could either have the effect to log the wrote stacktrace for creation or not log a stacktrace at all if the object was dropped on the floor after it was created.

Modifications:

Correctly create a Record on creation of the object.

Result:

Fixes https://github.com/netty/netty/issues/7781.
2018-03-16 08:24:18 +01:00
Norman Maurer
6eb9674bf5 Replace finalizer() usage in Recycler.WeakOrderQueue with ObjectCleaner usage.
Motivation:

We recently introduced ObjectCleaner which can be used to ensure some cleanup action is done once an object becomes weakable reachable. We should use this in Recycler.WeakOrderQueue to reduce the overhead of using a finalizer() (which will cause the GC to process it two times).

Modifications:

Replace finalizer() usage with ObjectCleaner

Result:

Fixes [#7343]
2018-03-09 18:45:02 -08:00
Norman Maurer
48df2f66b8 HashedWheelTimer.newTimeout(...) may overflow
Motivation:

We dont protect from overflow and so the timer may fire too early if a large timeout is used.

Modifications:

Add overflow guard and a test.

Result:

Fixes https://github.com/netty/netty/issues/7760.
2018-03-03 15:00:47 -08:00
Norman Maurer
69582c0b6c [maven-release-plugin] prepare for next development iteration 2018-02-21 12:52:33 +00:00
Norman Maurer
786f35c6c9 [maven-release-plugin] prepare release netty-4.1.22.Final 2018-02-21 12:52:19 +00:00
Carl Mastrangelo
15560530d4 Propagate full Unsafe unavailability reason in PlatformDependent
Motivation:
It is not clear why Unsafe is unavailable when it is explicitly
disabled, or when Netty thinks it is running on Android.

Modification:
Change the "has" fields and methods to be causes.  A null cause
means Unsafe is present.  This catches all possible reason why
Unsafe might not be available.

Result:
Easier to debug Netty start up when logging cannot be turned on.
2018-02-16 10:43:06 -08:00
Shohei Kamimori
73f23c5faa Fix typos in docs.
Motivation:

There are same typos in the docs.

Modifications:

Fix typos. Docs only changing.

Result:

More correct docs.
2018-02-14 08:44:07 +01:00
Scott Mitchell
4f982be91e
DefaultPromise internal state dependent on Signal
Motivation:
DefaultPromise's internal state depends upon specific Signal objects. These Signal objects can be used externally which causes the DefaultPromise object API to not function correct and state to become corrupted.

Modifications:
- DefaultPromise shouldn't depend upon Signal for its internal state

Result:
Fixes https://github.com/netty/netty/issues/7707
2018-02-12 14:24:46 -08:00
Scott Mitchell
6cd5e8b0ca Reduce the default number of objects retained by the Recycler per thread
Motivation:
The Recycler currently retains 32k objects per thread by default. The Recycler is used in more than just one place and may result in large amounts of memory bloat if spikes of traffic are observed.

Modifications:
- Reduce the Recyclers default capacity from 32k to 4k.

Result:
- Lower default capacity of the Recycler and less memory retained.
2018-02-09 19:56:01 +01:00
Johno Crawford
01e46ed03a System property util might return null
Motivation:

isAndroid0 should be robust.

Modifications:

yoda equals for string comparison.

Result:

No NPE.
2018-02-09 19:25:30 +01:00
Carl Mastrangelo
4ed961f4fe To detect Android, check the VM property rather than the classpath
Motivation:
Some java binaries include android classes on their classpath, even
if they aren't actually android.  When this is true, `Unsafe` no
longer works, disabling the Epoll functionality.  A sample case is
for binaries that use the j2objc library.

Modifications:
Check the `java.vm.name` instead of the classpath.   Numerous
Google-internal Android libraries / binaries check this property
rather than the class path.

It is believed this is safe and works with bother ART and Dalvik
VMs, safe for Robolectric, and j2objc.

Results:
Unusually built java server binaries can still use Netty Epoll.
2018-02-09 15:43:25 +01:00
Norman Maurer
e71fa1e7b6 [maven-release-plugin] prepare for next development iteration 2018-02-05 12:02:35 +00:00
Norman Maurer
41ebb5fcca [maven-release-plugin] prepare release netty-4.1.21.Final 2018-02-05 12:02:19 +00:00
koji lin
1e70d3092d Avoid register multiple cleaner task for same thread's FastThreadLocal index
Motivation:

Currently if user call set/remove/set/remove many times, it will create multiple cleaner task for same index. It may cause OOM due to long live thread will have more and more task in LIVE_SET.

Modification:

Add flag to avoid recreating tasks.

Result:
Only create 1 clean task. But use more space of indexedVariables.
2018-02-05 09:05:51 +01:00
Norman Maurer
e72c197aa3 Reflective setAccessible(true) will produce scary warnings on the console when using java9+, dont do it
Motivation:

Reflective setAccessible(true) will produce scary warnings on the console when using java9+, while netty still works. That said users may feel uncomfortable with these warnings, we should not try to do it by default when using java9+.

Modifications:

Add io.netty.tryReflectionSetAccessible  system property which controls if setAccessible(...) will be used. By default it will bet set to false when using java9+.

Result:

Fixes [#7254].
2018-01-30 12:18:34 +01:00
Jason
9dd5c928f3 Add java-doc for implemented methods of io.netty.util.concurrent.Future#cancel(boolean mayInterruptIfRunning)
Motivation:

The methods implement io.netty.util.concurrent.Future#cancel(boolean mayInterruptIfRunning) which actually ignored the param mayInterruptIfRunning.We need to add comments for the `mayInterruptIfRunning` param.

Modifications:

Add comments for the `mayInterruptIfRunning` param.

Result:

People who call the `cancel` method will be more clear about the effect of `mayInterruptIfRunning` param.
2018-01-29 11:19:52 +01:00
Norman Maurer
1879433ae6 ObjectCleanerThread must be a deamon thread to ensure the JVM can always terminate.
Motivation:

The ObjectCleanerThread must be a daemon thread as otherwise we may block the JVM from exit. By using a daemon thread we basically give the same garantees as the JVM when it comes to cleanup of resources (as the GC threads are also daemon threads and the CleanerImpl uses a deamon thread as well in Java9+).

Modifications:

Change ObjectCleanThread to be a daemon thread.

Result:

JVM shutdown will always be able to complete. Fixed [#7617].
2018-01-26 08:25:42 +01:00
jaymode
f0c76cacc3 Replace reflective access of Throwable#addSuppressed with version guarded access
Motivation:

In environments with a security manager, the reflective access to get the reference to
Throwable#addSuppressed can cause issues that result in Netty failing to load. The main
motivation in this pull request is to remove the use of reflection to prevent issues in
these environments.

Modifications:

ThrowableUtil no longer uses Class#getDeclaredMembers to get the Method that references
Throwable#addSuppressed and instead guards the call to Throwable#addSuppressed with a
Java version check.

Additionally, a annotation was added that suppresses the animal sniffer java16 signature
check on the given method. The benefit of the annotation is that it limits the exclusion
of Throwable to just the ThrowableUtil class and has string text indicating the reason
for suppressing the java16 signature check.

Result:

Netty no longer requires the use of Class#getDeclaredMethod for ThrowableUtil and will
work in environments restricted by a security manager without needing to grant reflection
permissions.

Fixes #7614
2018-01-25 19:56:17 +01:00
jaymode
c0e84070b0 Set thread context classloader in a doPrivileged block
Motivation:

In a few classes, Netty starts a thread and then sets the context classloader of these threads
to prevent classloader leaks. The Thread#setContextClassLoader method is a privileged method in
that it requires permissions to be executed when there is a security manager in place. Unless
these calls are wrapped in a doPrivileged block, they will fail in an environment with a security
manager and restrictive policy in place.

Modifications:

Wrap the calls to Thread#setContextClassLoader in a AccessController#doPrivileged block.

Result:

After this change, the threads can set the context classloader without any errors in an
environment with a security manager and restrictive policy in place.
2018-01-25 10:55:34 +01:00
Scott Mitchell
4921f62c8a
HttpResponseStatus object allocation reduction
Motivation:
Usages of HttpResponseStatus may result in more object allocation then necessary due to not looking for cached objects and the AsciiString parsing method not being used due to CharSequence method being used instead.

Modifications:
- HttpResponseDecoder should attempt to get the HttpResponseStatus from cache instead of allocating a new object
- HttpResponseStatus#parseLine(CharSequence) should check if the type is AsciiString and redirect to the AsciiString parsing method which may not require an additional toString call
- HttpResponseStatus#parseLine(AsciiString) can be optimized and doesn't require and may not require object allocation

Result:
Less allocations when dealing with HttpResponseStatus.
2018-01-24 22:01:52 -08:00
Norman Maurer
ea58dc7ac7 [maven-release-plugin] prepare for next development iteration 2018-01-21 12:53:51 +00:00
Norman Maurer
96c7132dee [maven-release-plugin] prepare release netty-4.1.20.Final 2018-01-21 12:53:34 +00:00
Scott Mitchell
031bad60dc ObjectCleaner should continue cleaning despite exceptions
Motivation:
ObjectCleaner inovkes a Runnable which may execute user code (FastThreadLocal#onRemoval) and therefore exceptions maybe thrown. If an exception is thrown the cleanup thread will exit prematurely and we may never finish cleaning up which will result in leaks.

Modifications:
- ObjectCleaner should suppress exceptions and continue cleaning

Result:
ObjectCleaner will reliably clean despite exceptions being thrown.
2018-01-19 20:09:20 +01:00
Scott Mitchell
f72f162e16 ObjectCleaner may indefinitely block on ReferenceQueue#poll
Motivation:
ObjectCleaner polls a ReferenceQueue which will block indefinitely. However it is possible there is a race condition between the live set of objects being empty due to the WeakReference being cleaned/cleared and polling the queue. If this situation occurs the cleanup thread may never unblock if no more objects are added to the live set, and may result in an application's failure to gracefully close.

Modifications:
- ReferenceQueue.remove should use a timeout to compensate for the race condition, and avoid dead lock

Result:
No more dead lock in ObjectCleaner when polling the ReferenceQueue.
2018-01-19 18:51:56 +01:00
Scott Mitchell
ea73e47a8b
FastThreadLocal#set remove duplicate isIndexedVariableSet call
Motivation:
FastThreadLocal#set calls isIndexedVariableSet to determine if we need to register with the cleaner, but the set(InternalThreadLocalMap, V) method will also internally do this check so we can share code and only do the check a single time.

Modifications:
- extract code from set(InternalThreadLocalMap, V) so it can be called externally to determine if a new item was created

Result:
Less code duplication in FastThreadLocal#set.
2017-12-22 09:41:57 -08:00
Norman Maurer
e004b4a354 Ensure ObjectCleaner will also be used when FastThreadLocal.set is used.
Motivation:

e329ca1 introduced the user of ObjectCleaner in FastThreadLocal but we missed the case to register our cleaner task if FastThreadLocal.set was called only.

Modifications:

- Use ObjectCleaner also when FastThreadLocal.set is used.
- Add test case.

Result:

ObjectCleaner is always used.
2017-12-22 07:11:22 +01:00
Nikolay Fedorovskikh
c9668ce40f The constants calculation in compile-time
Motivation:
Allow pre-computing calculation of the constants for compiler where it could be.
Similar fix in OpenJDK: [1].

Modifications:
- Use parentheses.
- Simplify static initialization of `BYTE2HEX_*` arrays in `StringUtil`.

Result:
Less bytecode, possible faster calculations at runtime.

[1] https://bugs.openjdk.java.net/browse/JDK-4477961
2017-12-21 07:41:38 +01:00
Norman Maurer
e329ca1cf3 Introduce ObjectCleaner and use it in FastThreadLocal to ensure FastThreadLocal.onRemoval(...) is called
Motivation:

There is no guarantee that FastThreadLocal.onRemoval(...) is called if the FastThreadLocal is used by "non" FastThreacLocalThreads. This can lead to all sort of problems, like for example memory leaks as direct memory is not correctly cleaned up etc.

Beside this we use ThreadDeathWatcher to check if we need to release buffers back to the pool when thread local caches are collected. In the past ThreadDeathWatcher was used which will need to "wakeup" every second to check if the registered Threads are still alive. If we can ensure FastThreadLocal.onRemoval(...) is called we do not need this anymore.

Modifications:

- Introduce ObjectCleaner and use it to ensure FastThreadLocal.onRemoval(...) is always called when a Thread is collected.
- Deprecate ThreadDeathWatcher
- Add unit tests.

Result:

Consistent way of cleanup FastThreadLocals when a Thread is collected.
2017-12-21 07:34:44 +01:00
Norman Maurer
640a22df9e Remove WeakOrderedQueue from WeakHashMap when FastThreadLocal value was removed if possible.
Motivation:

We should remove the WeakOrderedQueue from the WeakHashMap directly if possible and only depend on the semantics of the WeakHashMap if there is no other way for us to cleanup it.

Modifications:

Override onRemoval(...) to remove the WeakOrderedQueue if possible.

Result:

Less overhead and quicker collection of WeakOrderedQueue for some cases.
2017-12-15 21:21:18 +01:00
Norman Maurer
264a5daa41 [maven-release-plugin] prepare for next development iteration 2017-12-15 13:10:54 +00:00
Norman Maurer
0786c4c8d9 [maven-release-plugin] prepare release netty-4.1.19.Final 2017-12-15 13:09:30 +00:00
Norman Maurer
5ad35a157c SingleThreadEventExecutor ignores startThread failures
Motivation:

When doStartThread throws an exception, e.g. due to the actual executor being depleted of threads and throwing in its rejected execution handler, the STEE ends up in started state anyway. If we try to execute another task in this executor, it will be queued but the thread won't be started anymore and the task will linger forever.

Modifications:

- Ensure we not update the internal state if the startThread() method throws.
- Add testcase

Result:

Fixes [#7483]
2017-12-14 21:38:37 +00:00
Norman Maurer
0276b6e0f6 Ensure Thread can be collected in a timely manner if Recycler.Stack holds a reference to it.
Motivation:

In our Recycler implementation we store a reference to the current Thread in the Stack that is stored in a FastThreadLocal. The Stack itself is referenced in the DefaultHandle itself. A problem can arise if a user stores a Reference to an Object that holds a reference to the DefaultHandle somewhere and either not remove the reference at all or remove it very late. In this case the Thread itself can not be collected as its still referenced in the Stack that is referenced by the DefaultHandle.

Modifications:

- Use a WeakReference to store the reference to the Thread in the Stack
- Add a test case

Result:

Ensure a Thread can be collected in a timely manner in all cases even if it used the Recycler.
2017-12-14 06:44:47 +01:00
Norman Maurer
63bae0956a Ensure ThreadDeathWatcher and GlobalEventExecutor will not cause classloader leaks.
Motivation:

ThreadDeathWatcher and GlobalEventExecutor may create and start a new thread from various other threads and so inherit the classloader. We need to ensure we not inherit to allow recycling the classloader.

Modifications:

Use Thread.setContextClassLoader(null) to ensure we not hold a strong reference to the classloader and so not leak it.

Result:

Fixes [#7290].
2017-12-12 09:06:54 +01:00
Norman Maurer
b2bc6407ab [maven-release-plugin] prepare for next development iteration 2017-12-08 09:26:15 +00:00
Norman Maurer
96732f47d8 [maven-release-plugin] prepare release netty-4.1.18.Final 2017-12-08 09:25:56 +00:00
Norman Maurer
f2b1d95164 Fix javadocs for ObjectUtil methods.
Motivation:

The javadocs for a few methds in ObjectUtil are not correct.

Modifications:

Add "not" where it was missing.

Result:

Fixes [#7455].
2017-12-06 20:51:30 +01:00
Tomasz Jędrzejewski
e8540c2b7a Adding stable JDK9 module names that follow reverse-DNS style
Automatic-Module-Name entry provides a stable JDK9 module name, when Netty is used in a modular JDK9 applications. More info: http://blog.joda.org/2017/05/java-se-9-jpms-automatic-modules.html

When Netty migrates to JDK9 in the future, the entry can be replaced by actual module-info descriptor.

Modification:

The POM-s are configured to put the correct module names to the manifest.

Result:

Fixes #7218.
2017-11-29 11:50:24 +01:00
Norman Maurer
09a05b680d Dont use ThreadDeathWatcher to cleanup PoolThreadCache if FastThreadLocalThread with wrapped Runnable is used
Motivation:

We dont need to use the ThreadDeathWatcher if we use a FastThreadLocalThread for which we wrap the Runnable and ensure we call FastThreadLocal.removeAll() once the Runnable completes.

Modifications:

- Dont use a ThreadDeathWatcher if we are sure we will call FastThreadLocal.removeAll()
- Add unit test.

Result:

Less overhead / running theads if you only allocate / deallocate from FastThreadLocalThreads.
2017-11-28 13:43:28 +01:00
Norman Maurer
65cacc9b15 Guard against NoClassDefFoundError when trying to load Unsafe.
Motivation:

OSGI and other enviroments may not allow to even load Unsafe which will lead to an NoClassDefFoundError when trying to access it. We should guard against this.

Modifications:

Catch NoClassDefFoundError when trying to load Unsafe.

Result:

Be able to use netty with a strict OSGI config.
2017-11-24 20:06:30 +01:00
Soner Kaya
f9cadc0a8c When System property is empty use def value.
Motivation:

When system property is empty, the default value should be used.

Modification:

- Correctly use the default value in all cases
- Add unit tests

Result:

Correct behaviour
2017-11-23 19:45:37 +01:00
Scott Mitchell
0a47c590fe HttpHeaders valuesIterator and contains improvements
Motivation:
In order to determine if a header contains a value we currently rely
upon getAll(..) and regular expressions. This operation is commonly used
during the encode and decode stage to determine the transfer encoding
(e.g. HttpUtil#isTransferEncodingChunked). This operation requires an
intermediate collection and possibly regular expressions for the
CombinedHttpHeaders use case which can be expensive.

Modifications:
- Add a valuesIterator to HttpHeaders and specializations of this method
for DefaultHttpHeaders, ReadOnlyHttpHeaders, and CombinedHttpHeaders.

Result:
Less intermediate collections and allocation overhead when determining
if HttpHeaders contains a name/value pair.
2017-11-20 08:34:06 -08:00
Moses Nakamura
d976dc108d codec-http2: Improve h1 to h2 header conversion
Motivation:

Netty could handle "connection" or "te" headers more gently when
converting from http/1.1 to http/2 headers.  Http/2 headers don't
support single-hop headers, so when we convert from http/1.1 to http/2,
we should drop all single-hop headers.  This includes headers like
"transfer-encoding" and "connection", but also the headers that
"connection" points to, since "connection" can be used to designate
other headers as single-hop headers.  For the "te" header, we can more
permissively convert it by just dropping non-conforming headers (ie
non-"trailers" headers) which is what we do for all other headers when
we convert.

Modifications:

Add a new blacklist to the http/1.1 to http/2 conversion, which is
constructed from the values of the "connection" header, and stop
throwing an exception when a "te" header is passed with a non-"trailers"
value.  Instead, drop all values except for "trailers".  Add unit tests
for "connection" and "te" headers when converting from http/1.1 to http/2.

Result:

This will improve the h2c upgrade request, and also conversions from
http/1.1 to http/2.  This will simplify implementing spec-compliant
http/2 servers that want to share code between their http/1.1 and http/2
implementations.

[Fixes #7355]
2017-11-17 09:09:52 +01:00
Anuraag Agrawal
1f1a60ae7d Use Netty's DefaultPriorityQueue instead of JDK's PriorityQueue for scheduled tasks
Motivation:

`AbstractScheduledEventExecutor` uses a standard `java.util.PriorityQueue` to keep track of task deadlines. `ScheduledFuture.cancel` removes tasks from this `PriorityQueue`. Unfortunately, `PriorityQueue.remove` has `O(n)` performance since it must search for the item in the entire queue before removing it. This is fast when the future is at the front of the queue (e.g., already triggered) but not when it's randomly located in the queue.

Many servers will use `ScheduledFuture.cancel` on all requests, e.g., to manage a request timeout. As these cancellations will be happen in arbitrary order, when there are many scheduled futures, `PriorityQueue.remove` is a bottleneck and greatly hurts performance with many concurrent requests (>10K).

Modification:

Use netty's `DefaultPriorityQueue` for scheduling futures instead of the JDK. `DefaultPriorityQueue` is almost identical to the JDK version except it is able to remove futures without searching for them in the queue. This means `DefaultPriorityQueue.remove` has `O(log n)` performance.

Result:

Before - cancelling futures has varying performance, capped at `O(n)`
After - cancelling futures has stable performance, capped at `O(log n)`

Benchmark results

After - cancelling in order and in reverse order have similar performance within `O(log n)` bounds
```
Benchmark                                           (num)   Mode  Cnt       Score      Error  Units
ScheduledFutureTaskBenchmark.cancelInOrder            100  thrpt   20  137779.616 ± 7709.751  ops/s
ScheduledFutureTaskBenchmark.cancelInOrder           1000  thrpt   20   11049.448 ±  385.832  ops/s
ScheduledFutureTaskBenchmark.cancelInOrder          10000  thrpt   20     943.294 ±   12.391  ops/s
ScheduledFutureTaskBenchmark.cancelInOrder         100000  thrpt   20      64.210 ±    1.824  ops/s
ScheduledFutureTaskBenchmark.cancelInReverseOrder     100  thrpt   20  167531.096 ± 9187.865  ops/s
ScheduledFutureTaskBenchmark.cancelInReverseOrder    1000  thrpt   20   33019.786 ± 4737.770  ops/s
ScheduledFutureTaskBenchmark.cancelInReverseOrder   10000  thrpt   20    2976.955 ±  248.555  ops/s
ScheduledFutureTaskBenchmark.cancelInReverseOrder  100000  thrpt   20     362.654 ±   45.716  ops/s
```

Before - cancelling in order and in reverse order have significantly different performance at higher queue size, orders of magnitude worse than the new implementation.
```
Benchmark                                           (num)   Mode  Cnt       Score       Error  Units
ScheduledFutureTaskBenchmark.cancelInOrder            100  thrpt   20  139968.586 ± 12951.333  ops/s
ScheduledFutureTaskBenchmark.cancelInOrder           1000  thrpt   20   12274.420 ±   337.800  ops/s
ScheduledFutureTaskBenchmark.cancelInOrder          10000  thrpt   20     958.168 ±    15.350  ops/s
ScheduledFutureTaskBenchmark.cancelInOrder         100000  thrpt   20      53.381 ±    13.981  ops/s
ScheduledFutureTaskBenchmark.cancelInReverseOrder     100  thrpt   20  123918.829 ±  3642.517  ops/s
ScheduledFutureTaskBenchmark.cancelInReverseOrder    1000  thrpt   20    5099.810 ±   206.992  ops/s
ScheduledFutureTaskBenchmark.cancelInReverseOrder   10000  thrpt   20      72.335 ±     0.443  ops/s
ScheduledFutureTaskBenchmark.cancelInReverseOrder  100000  thrpt   20       0.743 ±     0.003  ops/s
```
2017-11-10 23:09:32 -08:00
Norman Maurer
188ea59c9d [maven-release-plugin] prepare for next development iteration 2017-11-08 22:36:53 +00:00
Norman Maurer
812354cf1f [maven-release-plugin] prepare release netty-4.1.17.Final 2017-11-08 22:36:33 +00:00
Carl Mastrangelo
ef5ebb40c9 Keep all leak records up to the target amount
Motivation:
When looking for a leak, its nice to be able to request at least a
number of leaks.

Modification:

* Made all leak records up to the target amoutn recorded, and only
  then enable backing off.
* Enable recording more than 32 elements.  Previously the shift
  amount made this impossible.

Result:
Ability to record all accesses.
2017-11-07 19:09:14 -08:00
Trask Stalnaker
58e74e9fee Support running Netty in bootstrap class loader
Motivation:

Fix NullPointerExceptions that occur when running netty-tcnative inside the bootstrap class loader.

Modifications:

- Replace loader.getResource(...) with ClassLoader.getSystemResource(...) when loader is null.
- Replace loader.loadClass(...) with Class.forName(..., false, loader) which works when loader is both null and non-null.

Result:

Support running native libs in bootstrap class loader
2017-10-29 13:13:19 +01:00
Carl Mastrangelo
e62e6df4ac Use WeakReferences for Resource Leaks
Motivation:
Phantom references are for cleaning up resources that were
forgotten, which means they keep their referent alive.   This
means garbage is kept around until the refqueue is drained, rather
than when the reference is unreachable.

Modification:
Use Weak References instead of Phantoms

Result:
More punctual leak detection.
2017-10-24 19:21:33 +02:00
Norman Maurer
740c68faed Add supresswarnings to cleanup 16b1dbdf92.
Motivation:

We should add @SupressWarnings

Modifications:

Add annotations.

Result:

Less warnings
2017-10-22 18:16:46 +02:00
Idel Pivnitskiy
4793daa589 Make Comparators Serializable
Motivation:

Objects of java.util.TreeMap or java.util.TreeSet will become
non-Serializable if instantiated with Comparators, which are not also
 Serializable. This can result in unexpected and difficult-to-diagnose
 bugs.

Modifications:

Implements Serializable for all classes, which implements Comparator.

Result:

Proper Comparators which will not force collections to
non-Serializable mode.
2017-10-22 03:40:28 +02:00
Idel Pivnitskiy
50a067a8f7 Make methods 'static' where it possible
Motivation:

Even if it's a super micro-optimization (most JVM could optimize such
 cases in runtime), in theory (and according to some perf tests) it
 may help a bit. It also makes a code more clear and allows you to
 access such methods in the test scope directly, without instance of
 the class.

Modifications:

Add 'static' modifier for all methods, where it possible. Mostly in
test scope.

Result:

Cleaner code with proper 'static' modifiers.
2017-10-21 14:59:26 +02:00
Idel Pivnitskiy
558097449c Add missed 'serialVersionUID' field for Serializable classes
Motivation:

Without a 'serialVersionUID' field, any change to a class will make
previously serialized versions unreadable.

Modifications:

Add missed 'serialVersionUID' field for all Serializable
classes.

Result:

Proper deserialization of previously serialized objects.
2017-10-21 14:41:18 +02:00
Carl Mastrangelo
16b1dbdf92 Motivation: Resource Leak Detector (RLD) tries to helpfully indicate where an object was last accessed and report the accesses in the case the object was not cleaned up. It handles lightly used objects well, but drops all but the last few accesses.
Configuring this is tough because there is split between highly shared (and accessed) objects and lightly accessed objects.

Modification:
There are a number of changes here.  In relative order of importance:

API / Functionality changes:
* Max records and max sample records are gone.  Only "target" records, the number of records tries to retain is exposed.
* Records are sampled based on the number of already stored records.  The likelihood of recording a new sample is `2^(-n)`, where `n` is the number of currently stored elements.
* Records are stored in a concurrent stack structure rather than a list.  This avoids a head and tail.  Since the stack is only read once, there is no need to maintain head and tail pointers
* The properties of this imply that the very first and very last access are always recorded.  When deciding to sample, the top element is replaced rather than pushed.
* Samples that happen between the first and last accesses now have a chance of being recorded.  Previously only the final few were kept.
* Sampling is no longer deterministic.  Previously, a deterministic access pattern meant that you could conceivably always miss some access points.
* Sampling has a linear ramp for low values and and exponentially backs off roughly equal to 2^n.  This means that for 1,000,000 accesses, about 20 will actually be kept.  I have an elegant proof for this which is too large to fit in this commit message.

Code changes:
* All locks are gone.  Because sampling rarely needs to do a write, there is almost 0 contention.  The dropped records counter is slightly contentious, but this could be removed or changed to a LongAdder.  This was not done because of memory concerns.
* Stack trace exclusion is done outside of RLD.  Classes can opt to remove some of their methods.
* Stack trace exclusion is faster, since it uses String.equals, often getting a pointer compare due to interning.  Previously it used contains()
* Leak printing is outputted fairly differently.  I tried to preserve as much of the original formatting as possible, but some things didn't make sense to keep.

Result:
More useful leak reporting.

Faster:
```
Before:
Benchmark                                           (recordTimes)   Mode  Cnt       Score      Error  Units
ResourceLeakDetectorRecordBenchmark.record                      8  thrpt   20  136293.404 ± 7669.454  ops/s
ResourceLeakDetectorRecordBenchmark.record                     16  thrpt   20   72805.720 ± 3710.864  ops/s
ResourceLeakDetectorRecordBenchmark.recordWithHint              8  thrpt   20  139131.215 ± 4882.751  ops/s
ResourceLeakDetectorRecordBenchmark.recordWithHint             16  thrpt   20   74146.313 ± 4999.246  ops/s

After:
Benchmark                                           (recordTimes)   Mode  Cnt       Score      Error  Units
ResourceLeakDetectorRecordBenchmark.record                      8  thrpt   20  155281.969 ± 5301.399  ops/s
ResourceLeakDetectorRecordBenchmark.record                     16  thrpt   20   77866.239 ± 3821.054  ops/s
ResourceLeakDetectorRecordBenchmark.recordWithHint              8  thrpt   20  153360.036 ± 8611.353  ops/s
ResourceLeakDetectorRecordBenchmark.recordWithHint             16  thrpt   20   78670.804 ± 2399.149  ops/s
```
2017-10-19 12:21:21 -07:00
Johno Crawford
f301edfb9d Upgrade dependencies to versions which use ASM 6.0.0+
Motivation:

We need to upgrade our dependencies to versions which use ASM 6.0.0+ to support compiling on java9.

Modifications:

Update animal-sniffer-maven-plugin and maven-shade-plugin.

Result:

Fixes https://github.com/netty/netty/issues/6100
2017-10-07 12:45:25 +02:00
Carl Mastrangelo
d3ca087f6b Propagate all exceptions when loading native code
Motivation:
There are 2 motivations, the first depends on the second:

Loading Netty Epoll statically stopped working in 4.1.16, due to
`Native` always loading the arch specific shared object.  In a
static binary, there is no arch specific SO.

Second, there are a ton of exceptions that can happen when loading
a native library.  When loading native code, Netty tries a bunch of
different paths but a failure in any given may not be fatal.

Additionally: turning on debug logging is not always feasible so
exceptions get silently swallowed.

Modifications:

* Change Epoll and Kqueue to try the static load second
* Modify NativeLibraryLoader to record all the locations where
  exceptions occur.
* Attempt to use `addSuppressed` from Java 7 if available.

Alternatives Considered:

An alternative would be to record log messages at each failure.  If
all load attempts fail, the log messages are printed as warning,
else as debug. The problem with this is there is no `LogRecord` to
create like in java.util.logging.  Buffering the args to
logger.log() at the end of the method loses the call site, and
changes the order of events to be confusing.

Another alternative is to teach NativeLibraryLoader about loading
the SO first, and then the static version.  This would consolidate
the code fore Epoll, Kqueue, and TCNative.   I think this is the
long term better option, but this PR is changing a lot already.
Someone else can take a crack at it later

Results:
Epoll Still Loads and easier debugging.
2017-10-04 08:45:27 +02:00
Carl Mastrangelo
83a19d5650 Optimistically update ref counts
Motivation:
Highly retained and released objects have contention on their ref
count.  Currently, the ref count is updated using compareAndSet
with care to make sure the count doesn't overflow, double free, or
revive the object.

Profiling has shown that a non trivial (~1%) of CPU time on gRPC
latency benchmarks is from the ref count updating.

Modification:
Rather than pessimistically assuming the ref count will be invalid,
optimistically update it assuming it will be.  If the update was
wrong, then use the slow path to revert the change and throw an
execption.  Most of the time, the ref counts are correct.

This changes from using compareAndSet to getAndAdd, which emits a
different CPU instruction on x86 (CMPXCHG to XADD).  Because the
CPU knows it will modifiy the memory, it can avoid contention.

On a highly contended machine, this can be about 2x faster.

There is a downside to the new approach.  The ref counters can
temporarily enter invalid states if over retained or over released.
The code does handle these overflow and underflow scenarios, but it
is possible that another concurrent access may push the failure to
a different location.  For example:

Time 1 Thread 1: obj.retain(INT_MAX - 1)
Time 2 Thread 1: obj.retain(2)
Time 2 Thread 2: obj.retain(1)

Previously Thread 2 would always succeed and Thread 1 would always
fail on the second access.  Now, thread 2 could fail while thread 1
is rolling back its change.

====

There are a few reasons why I think this is okay:

1. Buggy code is going to have bugs.  An exception _is_ going to be
   thrown.  This just causes the other threads to notice the state
   is messed up and stop early.
2. If high retention counts are a use case, then ref count should
   be a long rather than an int.
3. The critical section is greatly reduced compared to the previous
   version, so the likelihood of this happening is lower
4. On error, the code always rollsback the change atomically, so
   there is no possibility of corruption.

Result:
Faster refcounting

```
BEFORE:

Benchmark                                                                                             (delay)    Mode      Cnt         Score    Error  Units
AbstractReferenceCountedByteBufBenchmark.retainRelease_contended                                            1  sample  2901361       804.579 ±  1.835  ns/op
AbstractReferenceCountedByteBufBenchmark.retainRelease_contended                                           10  sample  3038729       785.376 ± 16.471  ns/op
AbstractReferenceCountedByteBufBenchmark.retainRelease_contended                                          100  sample  2899401       817.392 ±  6.668  ns/op
AbstractReferenceCountedByteBufBenchmark.retainRelease_contended                                         1000  sample  3650566      2077.700 ±  0.600  ns/op
AbstractReferenceCountedByteBufBenchmark.retainRelease_contended                                        10000  sample  3005467     19949.334 ±  4.243  ns/op
AbstractReferenceCountedByteBufBenchmark.retainRelease_uncontended                                          1  sample   456091        48.610 ±  1.162  ns/op
AbstractReferenceCountedByteBufBenchmark.retainRelease_uncontended                                         10  sample   732051        62.599 ±  0.815  ns/op
AbstractReferenceCountedByteBufBenchmark.retainRelease_uncontended                                        100  sample   778925       228.629 ±  1.205  ns/op
AbstractReferenceCountedByteBufBenchmark.retainRelease_uncontended                                       1000  sample   633682      2002.987 ±  2.856  ns/op
AbstractReferenceCountedByteBufBenchmark.retainRelease_uncontended                                      10000  sample   506442     19735.345 ± 12.312  ns/op

AFTER:
Benchmark                                                                                             (delay)    Mode      Cnt         Score    Error  Units
AbstractReferenceCountedByteBufBenchmark.retainRelease_contended                                            1  sample  3761980       383.436 ±  1.315  ns/op
AbstractReferenceCountedByteBufBenchmark.retainRelease_contended                                           10  sample  3667304       474.429 ±  1.101  ns/op
AbstractReferenceCountedByteBufBenchmark.retainRelease_contended                                          100  sample  3039374       479.267 ±  0.435  ns/op
AbstractReferenceCountedByteBufBenchmark.retainRelease_contended                                         1000  sample  3709210      2044.603 ±  0.989  ns/op
AbstractReferenceCountedByteBufBenchmark.retainRelease_contended                                        10000  sample  3011591     19904.227 ± 18.025  ns/op
AbstractReferenceCountedByteBufBenchmark.retainRelease_uncontended                                          1  sample   494975        52.269 ±  8.345  ns/op
AbstractReferenceCountedByteBufBenchmark.retainRelease_uncontended                                         10  sample   771094        62.290 ±  0.795  ns/op
AbstractReferenceCountedByteBufBenchmark.retainRelease_uncontended                                        100  sample   763230       235.044 ±  1.552  ns/op
AbstractReferenceCountedByteBufBenchmark.retainRelease_uncontended                                       1000  sample   634037      2006.578 ±  3.574  ns/op
AbstractReferenceCountedByteBufBenchmark.retainRelease_uncontended                                      10000  sample   506284     19742.605 ± 13.729  ns/op

```
2017-10-04 08:42:33 +02:00
Norman Maurer
625a7426cd [maven-release-plugin] prepare for next development iteration 2017-09-25 06:12:32 +02:00
Norman Maurer
f57d8f00e1 [maven-release-plugin] prepare release netty-4.1.16.Final 2017-09-25 06:12:16 +02:00
Norman Maurer
c3298a3836 Fix regression in reporting leaks introduced by 3c8c7fc7e9.
Motivation:

3c8c7fc7e9 introduced some changes to the ResourceLeakDetector that introduced a regression and so would always log that paranoid leak detection should be enabled even it was already.

Modifications:

Correctly not clear the recorded stacktraces when we process the reference queue so we can log these.

Result:

ResourceLeakDetector works again as expected.
2017-09-21 12:17:43 -07:00
Norman Maurer
4d5f0e7ad5 NativeLibraryLoader should check the result of ClassLoader#getResource method
Motivation:

NativeLibraryLoader uses ClassLoader#getResource method that can return nulls when the resource cannot be found. The returned url variable should be checked for nullity and fail in a more usable manner than a NullPointerException

Modifications:

Fail with a FileNotFoundException

Result:

Fixes [#7222].
2017-09-19 17:45:06 -07:00
Norman Maurer
3c8c7fc7e9 Reduce performance overhead of ResourceLeakDetector
Motiviation:

The ResourceLeakDetector helps to detect and troubleshoot resource leaks and is often used even in production enviroments with a low level. Because of this its import that we try to keep the overhead as low as overhead. Most of the times no leak is detected (as all is correctly handled) so we should keep the overhead for this case as low as possible.

Modifications:

- Only call getStackTrace() if a leak is reported as it is a very expensive native call. Also handle the filtering and creating of the String in a lazy fashion
- Remove the need to mantain a Queue to store the last access records
- Add benchmark

Result:

Huge decrease of performance overhead.

Before the patch:

Benchmark                                           (recordTimes)   Mode  Cnt     Score     Error  Units
ResourceLeakDetectorRecordBenchmark.record                      8  thrpt   20  4358.367 ± 116.419  ops/s
ResourceLeakDetectorRecordBenchmark.record                     16  thrpt   20  2306.027 ±  55.044  ops/s
ResourceLeakDetectorRecordBenchmark.recordWithHint              8  thrpt   20  4220.979 ± 114.046  ops/s
ResourceLeakDetectorRecordBenchmark.recordWithHint             16  thrpt   20  2250.734 ±  55.352  ops/s

With this patch:

Benchmark                                           (recordTimes)   Mode  Cnt      Score      Error  Units
ResourceLeakDetectorRecordBenchmark.record                      8  thrpt   20  71398.957 ± 2695.925  ops/s
ResourceLeakDetectorRecordBenchmark.record                     16  thrpt   20  38643.963 ± 1446.694  ops/s
ResourceLeakDetectorRecordBenchmark.recordWithHint              8  thrpt   20  71677.882 ± 2923.622  ops/s
ResourceLeakDetectorRecordBenchmark.recordWithHint             16  thrpt   20  38660.176 ± 1467.732  ops/s
2017-09-18 16:36:19 -07:00
Carl Mastrangelo
b32cd26a96 Remove allocation from ResourceLeakDetector
Motivation:
RLD allocates an ArrayDeque in anticipation of recording access
points.  If the leak detection level is less than ADVANCED though,
the dequeue is never used.  Since SIMPLE is the default level,
there is a minor perf win to not preemptively allocate it.

This showed up in garbage profiling when creation a high number of
buffers.

Modifications:
Only allocate the dequeue if it will be used.

Result:
Less garbage created.
2017-09-15 20:22:31 -07:00
Scott Mitchell
b1332bf12e NativeLibraryLoader logging clarify
Motivation:
NativeLibraryLoader may only log a debug statement if the library is successfully loaded from java.library.path, but will log failure statements the if load for java.library.path fails which can mislead users to believe the load actually failed when it may have succeeded.

Modifications:
- Always load a debug statement when a library was successfully loaded

Result:
NativeLibraryLoader log statements more clear.
2017-09-15 09:17:44 -07:00
杨浩
14189140a0 log in PatternLayout (%F:%L)%c.%M
Motivation:

When Log4j2Logger is used with PatternLayout (%F:%L)%c.%M, the log message incorrect shows:

(Log4J2Logger.java:73)io.netty.util.internal.PlatformDependent0.debug ....

Modification:

Extend AbstractLogger

Result:

Fixes [#7186].
2017-09-14 14:51:20 -07:00
Norman Maurer
0fffc844d6 Only load native transport if running architecture match the compiled library architecture.
Motivation:

We should only try to load the native artifacts if the architecture we are currently running on is the same as the one the native libraries were compiled for.

Modifications:

Include architecture in native lib name and append the current arch when trying to load these. This will fail then if its not the same as the arch of the compiled arch.

Result:

Fixes [#7150].
2017-09-04 13:34:55 +02:00
Norman Maurer
bca35b0449 Allow to construct UnpooledByteBufAllocator that explictly always use sun.misc.Cleaner
Motivation:

When the user want to have the direct memory explicitly managed by the GC (just as java.nio does) it is useful to be able to construct an UnpooledByteBufAllocator that allows this without the chances to see any memory leak.

Modifications:

Allow to explicitly disable the usage of reflection to construct direct ByteBufs and so be sure these will be collected by GC.

Result:

More flexible way to use the UnpooledByteBufAllocator.
2017-08-31 12:57:09 +02:00
Carl Mastrangelo
7528e5a11e Use threadsafe setter on Atomic Updaters
Motivation:
The documentation for field updates says:

> Note that the guarantees of the {@code compareAndSet}
> method in this class are weaker than in other atomic classes.
> Because this class cannot ensure that all uses of the field
> are appropriate for purposes of atomic access, it can
> guarantee atomicity only with respect to other invocations of
> {@code compareAndSet} and {@code set} on the same updater.

This implies that volatiles shouldn't use normal assignment; the
updater should set them.

Modifications:
Use setter for field updaters that make use of compareAndSet.

Result:
Concurrency compliant code
2017-08-31 10:14:40 +02:00
Carl Mastrangelo
c891c9c13f Include more detail why Unsafe is not available
Motivation:
PD and PD0 Both try to find and use Unsafe.  If unavailable, they
try to log why and continue on.  However, it is not always east to
enable this logging.  Chaining exceptions together is much easier
to reach, and the original exception is relevant when Unsafe is
needed.

Modifications:
* Make PD log why PD0 could not be loaded with a trace level log
* Make PD0 remember why Unsafe wasn't available
* Expose unavailability cause through PD for higher level use.
* Make Epoll and KQueue include the reason when failing

Result:
Easier debugging in hard to reconfigure environments
2017-08-29 22:02:06 +02:00
Norman Maurer
b967805f32 [maven-release-plugin] prepare for next development iteration 2017-08-24 15:38:22 +02:00
Norman Maurer
da8e010a42 [maven-release-plugin] prepare release netty-4.1.15.Final 2017-08-24 15:37:59 +02:00
Derek Perez
b18a201d02 various errorprone fixes.
Motivation:

Continuing to make netty happy when compiling through errorprone.

Modification:

Mostly comments, some minor switch statement changes.

Result:

No more compiler errors!
2017-08-23 12:49:58 +02:00
Aron Wieck
da86b85a28 Make NativeLibraryLoader check java.library.path first
Motivation:

On restricted systems (e.g. grsecurity), it might not be possible to write a .so on disk and load it afterwards. On those system Netty should check java.library.path for libraries to load.

Modifications:

Changed NativeLibraryLoader.java to first try to load libs from java.library.path before exporting the .so to disk.

Result:

Libraries load fine on restricted systems.
2017-08-16 14:27:50 -07:00
Derek Perez
3469004432 Adding explicit comment about case statement
Motivation:

When compiling this code and running it through errorprone[1], this message appears:
```
StringUtil.java:493: error: [FallThrough] Switch case may fall through; add a `// fall through` comment if it was deliberate
                    case LINE_FEED:
                    ^
    (see http://errorprone.info/bugpattern/FallThrough)
```
By adding that comment, it silences the error and also makes clear the intention of that statement.

[1]http://errorprone.info/index

Modification:

Add simple comment.

Result:

Errorprone is happier with the code.
2017-08-16 07:38:11 +02:00
Nikolay Fedorovskikh
4875a2aad4 Immediate caching the strings wrapped to AsciiString
Motivation:
The `AsciiString#toString` method calculate string value and cache it into field. If an `AsciiString` created from the `String` value, we can avoid rebuilding strings if we cache them immediately when creating `AsciiString`. It would be useful for constants strings, which already stored in the JVMs string table, or in cases where an unavoidable `#toString `method call is assumed.

Modifications:
- Add new static method `AsciiString#cache(String)` which save string value into cache field.
- Apply a "benign" data race in the `#hashCode` and `#toString` methods.

Result:
Less memory usage in some `AsciiString` use cases.
2017-08-15 06:22:14 +02:00
Norman Maurer
19dcb15062 Use underscore in native library names for consistency.
Motivation:

At the moment we try to load the library using multiple names which includes names using - but also _ . We should just use _ all the time.

Modifications:

Replace - with _

Result:

Fixes [#7069]
2017-08-15 06:02:00 +02:00
Nikolay Fedorovskikh
e249b453a0 Make configurable the initial and max size of InternalThreadLocalMap#stringBuilder
Motivation:
In some cases of using an `InternalThreadLocalMap#stringBuilder`, the `StringBuilder`s size can often exceed the exist limit (1024 bytes). This can lead to permanent memory reallocation.

Modifications:
Add custom properties for the initial capacity and maximum size (after which the `StringBuilder`s capacity will be reduced to the initial capacity).

Result:
An `InternalThreadLocalMap#stringBuilder`s initial and max size is configurable. Fixes [#7092].
2017-08-14 13:27:58 -07:00
Norman Maurer
b30c4f899f Remove debug cruft from e218759c0c 2017-08-08 17:01:31 +02:00
Norman Maurer
e218759c0c Fix regression in detecting macOS/osx platform introduced by bdb0a39c8a 2017-08-08 10:39:22 +02:00
Norman Maurer
bdb0a39c8a Remove code-duplication from NativeLibraryLoader
Motivation:

NativeLibraryLoader has some code-duplication that can be removed.

Modifications:

Remove duplicated code and just use provided methods of PlatformDependent.

Result:

Less code duplication, fixes [#3756].
2017-08-08 09:06:41 +02:00
Scott Mitchell
a75ac747f0 Remove io.netty.packagePrefix system property
Motivation:
Now that the NativeLibraryLoader implicitly detects the shaded package prefix we no longer need the io.netty.packagePrefix system property.

Modifications:
- Remove io.netty.packagePrefix processing from NativeLibraryLoader

Result:
Code is cleaner.
2017-08-04 10:53:29 +02:00
Norman Maurer
52f384b37f [maven-release-plugin] prepare for next development iteration 2017-08-02 12:55:10 +00:00
Norman Maurer
8cc1071881 [maven-release-plugin] prepare release netty-4.1.14.Final 2017-08-02 12:54:51 +00:00
Eric Anderson
e5a31a4282 Automatically detect shaded packagePrefix
Motivation:

Shading requires renaming binary components (.so, .dll; for tcnative,
epoll, etc). But the rename then requires setting the
io.netty.packagePrefix system property on the command line or runtime,
which is either a burden or not feasible.

If you don't rename the binary components everything appears to
work, until a dependency on a second version of the binary component is
added. At that point, only one version of the binary will be loaded...
which is what shading is supposed to prevent. So for valid shading, the
binaries must be renamed.

Modifications:

Automatically detect the package prefix by comparing the actual class
name to the non-shaded expected class name. The expected class name must
be obfuscated to prevent shading utilities from changing it.

Result:

When shading and using binary components, runtime configuration is no
longer necessary.

Pre-existing shading users that were not renaming the binary components
will break, because the packagePrefix previously defaulted to "". Since
these pre-existing users had broken configurations that only _appeared_
to work, this breakage is considered a Good Thing. Users may workaround
this breakage temporarily by setting -Dio.netty.packagePrefix= to
restore packagePrefix to "".

Fixes #6963
2017-07-19 18:38:02 -07:00
louxiu
96e06aa74d Calculate correct lastRecords size
Motivation:
ResourceLeakDetector records at most MAX_RECORDS+1 records

Modifications:
Make room before add to lastRecords

Result:
ResourceLeakDetector will record at most MAX_RECORDS records
2017-07-18 19:14:31 -07:00
kashike
c43e09da5a Use the correct murmur3 C1 value
introduced in a7f7d9c8e0
2017-07-18 19:03:33 -07:00
Scott Mitchell
7cfe416182 Use unbounded queues from JCTools 2.0.2
Motivation:
JCTools 2.0.2 provides an unbounded MPSC linked queue. Before we shaded JCTools we had our own unbounded MPSC linked queue and used it in various places but gave this up because there was no public equivalent available in JCTools at the time.

Modifications:
- Use JCTool's MPSC linked queue when no upper bound is specified

Result:
Fixes https://github.com/netty/netty/issues/5951
2017-07-10 12:32:15 -07:00
Norman Maurer
2a376eeb1b [maven-release-plugin] prepare for next development iteration 2017-07-06 13:24:06 +02:00
Norman Maurer
c7f8168324 [maven-release-plugin] prepare release netty-4.1.13.Final 2017-07-06 13:23:51 +02:00
Nikolay Fedorovskikh
01eb428b39 Move methods for decode hex dump into StringUtil
Motivation:

PR #6811 introduced a public utility methods to decode hex dump and its parts, but they are not visible from netty-common.

Modifications:

1. Move the `decodeHexByte`, `decodeHexDump` and `decodeHexNibble` methods into `StringUtils`.
2. Apply these methods where applicable.
3. Remove similar methods from other locations (e.g. `HpackHex` test class).

Result:

Less code duplication.
2017-06-23 18:52:42 +02:00
Nikolay Fedorovskikh
aa38b6a769 Prevent unnecessary allocations in the StringUtil#escapeCsv
Motivation:

A `StringUtil#escapeCsv` creates new `StringBuilder` on each value even if the same string is returned in the end.

Modifications:

Create new `StringBuilder` only if it really needed. Otherwise, return the original string (or just trimmed substring).

Result:

Less GC load. Up to 4x faster work for not changed strings.
2017-06-13 14:57:38 -07:00
Scott Mitchell
1cc4607f07 AppendableCharSequence not to depend upon IndexOutOfBoundsException for resize
Motivation:
AppendableCharSequence depends upon IndexOutOfBoundsException to trigger a resize operation under the assumption that the resize operation will be rare if the initial size guess is good. However if the initial size guess is not good then the performance will be more unpredictable and likely suffer.

Modifications:
- Check the position in AppendableCharSequence#append to determine if a resize is necessary

Result:
More predictable performance in AppendableCharSequence#append.
2017-06-12 12:42:20 -07:00
Norman Maurer
fd67a2354d [maven-release-plugin] prepare for next development iteration 2017-06-08 21:06:24 +02:00
Norman Maurer
3acd5c68ea [maven-release-plugin] prepare release netty-4.1.12.Final 2017-06-08 21:06:01 +02:00
Norman Maurer
f208b147a6 Use FQCN to prevent classloader issues on java6
Motivation:

We need to use FQCN to prevent classloader issues for classes that are > Java6. This is a cleanup of ed5fcbb773.

Modifications:

Just remove the imports and use FQCN.

Result:

No classloader issues with java6
2017-06-08 12:04:17 +02:00
Michael K. Werle
ed5fcbb773 Add explicit message when noexec prevents library loading.
Motivation:

Docker's `--tmpfs` flag mounts the temp volume with `noexec` by default,
resulting in an UnsatisfiedLinkError.  While this is good security
practice, it is a surprising failure from a seemingly innocuous flag.

Modifications:

Add a best-effort attempt in `NativeLibraryLoader` to detect when temp
files beng loaded cannot be executed even when execution permissions
are set, often because the `noexec` flag is set on the volume.

Requires numerous additional exclusions to the Animal Sniffer config
for Java7 POSIX permissions manipulation.

Result:

Fixes [#6678].
2017-06-07 09:20:05 -07:00
Norman Maurer
201d9b6536 Share code that is needed to support shaded native libraries.
Motivation:

For our native libraries in netty we support shading, to have this work on runtime the user needs to set a system property. This code should shared.

Modifications:

Move logic to NativeLbiraryLoader and so share for all native libs.

Result:

Less code duplication and also will work for netty-tcnative out of the box once it support shading
2017-05-19 19:33:21 +02:00
Nikolay Fedorovskikh
d768c5e628 MessageFormatter improvements
Motivation:

`FormattingTuple.getArgArray()` is never used.
In the `MessageFormatter` it is possible to make
some improvements, e.g. replace `StringBuffer`
with `StringBuilder`, avoid redundant allocations, etc.

Modifications:

- Remove `argArray` field from the `FormattingTuple`.
- In `MessageFormatter`:
  - replace `StringBuffer` with `StringBuilder`,
  - replace `HashMap` with `HashSet` and make it lazy initialized.
  - avoid redundant allocations (`substring()`, etc.)
  - use appropriate StringBuilder's methods for the some `Number` values.
- Porting unit tests from `slf4j`.

Result:

Less GC load on logging with internal `MessageFormatter`.
2017-05-19 09:47:11 -07:00
Nikolay Fedorovskikh
e4531918a3 Optimizations in NetUtil
Motivation:

IPv4/6 validation methods use allocations, which can be avoided.
IPv4 parse method use StringTokenizer.

Modifications:

Rewriting IPv4/6 validation methods to avoid allocations.
Rewriting IPv4 parse method without use StringTokenizer.

Result:

IPv4/6 validation and IPv4 parsing faster up to 2-10x.
2017-05-18 16:42:22 -07:00
Norman Maurer
0ee49e6d66 Eliminate noisy logging when using sun.misc.Unsafe and running on pre Java9
Motivation:

We should only try to load jdk.internal.misc.Unsafe if we run on Java9+ to eliminate noise in the log.

Modifications:

- Move javaVersion() and related methods to PlatformDependent0 to be able to use these in the static initializer without creating a cycle.
- Only try to load jdk.internal.misc.Unsafe when running in Java9+

Result:

Less noise in the log when running pre java9.
2017-05-16 08:29:06 +02:00
Jason Tedor
d88cd23bfc Trim thread local string builder if large
Motivation:

A previous change allocated a new thread local string builder if it
was getting too large. This is a good change, these string builders
can accidentally get too large and then never shrunk and that is sort
of a memory leak. However, the change allocates an entirely new string
builder which is more allocations than necessary. Instead, we can trim
the string builder if its too large, this only allocates an extra
backing array instead of a whole new object.

Modifications:

If the string builder is above a threshold, we trim the string builder
and then ensure its capacity is reasonable to we do not allocate too
much as we start using the string builder.

Result:

The thread local string builder do not serve as a memory yet we do not
allocate too many new objects.
2017-05-12 08:20:04 +02:00
Norman Maurer
0db2901f4d [maven-release-plugin] prepare for next development iteration 2017-05-11 16:00:55 +02:00