Motivation:
DefaultAttributeMap::attr has a blocking behaviour on lookup of an existing attribute:
it can be made non-blocking.
Modification:
Replace the existing fixed bucket table using a locked intrusive linked list
with an hand-rolled copy-on-write ordered single array
Result:
Non blocking behaviour for the lookup happy path
Motivation:
writeUtf8 can suffer from inlining issues and/or megamorphic call-sites on the hot path due to ByteBuf hierarchy
Modifications:
Duplicate and specialize the code paths to reduce the need of polymorphic calls
Result:
Performance are more stable in user code
Motivation:
We're converting `Inet4Address` to `Integer` quite frequently so it's a good idea to keep that code in `NetUtils`.
Modification:
Added ipv4AddressToInt(Inet4Address) in NetUtils
Result:
Easy conversion of `Inet4Address` to `Integer`.
Motivation:
It makes no sense to remove the task when the underlying executor fails as we may be able to pick it up later. Beside this the used Queue doesnt support remove(...) and so will throw.
Modifications:
Remove the queue.remove(...) call
Result:
Fixes https://github.com/netty/netty/issues/10501.
Motivation:
The executor chooser should pluck executors in round-robin, but at the 32-bit
overflow boundary, the round-robin sequence was disrupted when the number of
executors are not a power of 2.
Modification:
Changed the index counter from a 32-bit to a 64-bit long. The overflow bug is
still technically there, but it now takes so long to reach that it will never
happen in practice. For example, 2^63 nanoseconds is almost 300 years.
Result:
The round-robin behaviour for all EventExecutorChoosers is now preserved in
practice.
This fixes#10423.
Motivation:
Recent Intellij versions are starting to anticipate
future versions of Java that include a
`java.lang.Record` class, and the Intellij compiler
gets confused by the `Record` class in our
`ResorceLeakDetector`.
Modification:
Rename our `Record` class to `TracerRecord`.
This matches what the class is doing, while avoiding
any future name clashes.
Result:
Intellij can now compile the project again, even when
configured to use a future (snapshot or early access)
version of Java.
Motivation:
SSLEngineImpl.unwrap(...) may call FileInputStream.read(...) internally when TLS1.3 is used. This will cause an BlockingOperationError when BlockHound is enabled.
For more details see https://mail.openjdk.java.net/pipermail/security-dev/2020-August/022271.html
Modifications:
- Add whitelist entry to BlockHound config for now
- Update NettyBlockHoundIntegrationTest to include testing for this workaround
Result:
No BlockingOperationError when TLS1.3 is used with JDK SSL implementation and BlockHound is enabled
Motivation:
GraalVM's native images built with native-image tool do not support Unsafe.staticFieldOffset() method (at least, currently). If an application using Netty (and causing initialization of io.netty.util.internal.PlatformDependent0 class) is built into a native image and run, this results in the following error thrown during initialization:
Exception in thread "main" com.oracle.svm.core.jdk.UnsupportedFeatureError: Unsupported method of Unsafe
at com.oracle.svm.core.util.VMError.unsupportedFeature(VMError.java:86)
at jdk.internal.misc.Unsafe.staticFieldOffset(Unsafe.java:230)
at sun.misc.Unsafe.staticFieldOffset(Unsafe.java:662)
at io.netty.util.internal.PlatformDependent0$5.run(PlatformDependent0.java:294)
at java.security.AccessController.doPrivileged(AccessController.java:83)
at io.netty.util.internal.PlatformDependent0.<clinit>(PlatformDependent0.java:279)
This seems to be the reason of the behavior described in #10051.
Modification:
The idea of this commit is to only invoke Unsafe.staticFieldOffset() is we are not in a native image; if we are, behave like if we could not find the field at all.
GraalDetector is borrowed from Spring framework.
Result:
Fixes#10051
Motivation:
We should provide details about why an IOOBE was thrown
Modification:
Add IndexOutOfBoundsException error information in io.netty.util.internal.AppendableCharSequence and io.netty.handler.codec.CodecOutputList class
Result:
Easier to debug
Motivation:
When a switch statement is used we should always define a `default:` so we don't introduce bugs due fall-through.
Modification:
Add missing `default:`s
Result:
Less error-prone code
Motivation:
When BlockHound is installed,
ReferenceCountedOpenSslClientContext$ExtendedTrustManagerVerifyCallback.verify
is reported as blocking call.
Modifications:
Add allowBlockingCallsInside configuration for
ReferenceCountedOpenSslClientContext$ExtendedTrustManagerVerifyCallback.verify
Result:
Fixes#10384
Motivation:
newResourceLeakDetector(...) did not correctly pass the samplingInterval parameter and so it was ignored.
Modification:
ResourceLeakDetectorFactory.newResourceLeakDetector(Class, int) use the second parameter as the sampling interval of the newly created ResourceLeakDetector.
Result:
Fixes#10378
Motivation:
Unsafe users are getting MpscChunkedArrayQueue while no Unsafe ones MpscGrowableAtomicArrayQueue
Modifications:
MpscChunkedAtomicArrayQueue should be used for no Unsafe users (matching MpscChunkedArrayQueue behaviour)
Result:
no Unsafe users uses MpscChunkedAtomicArrayQueue while allocating bounded Mpsc Queues
Motivation:
Fix very tiny comment error in Recycler
Modifications:
Fix very tiny comment error in Recycler
Result:
Correctly comment about drop in WeakOrderQueue#add
Motivation:
GlobalEventExecutor#addTask may be called during SingleThreadEventExecutor shutdown.
May result in a blocking call, because GlobalEventExecutor#taskQueue is a BlockingQueue.
Modifications:
Add allowBlockingCallsInside configuration for GlobalEventExecutor#addTask.
Result:
Fixes#10257.
When BlockHound is installed, GlobalEventExecutor#addTask is not reported as a blocking call.
Motivation
- Recycler stack and delayed queue drop ratio can only be configured with
the same value. The overall drop ratio is ratio^2.
- #10251 shows that enable drop in `WeakOrderQueue` may introduce
performance degradation. Though the final reason is not clear now,
it would be better to add option to configure delayed queue drop ratio separately.
Modification
- "io.netty.recycler.delayedQueue.ratio" as the drop ratio of delayed queue
- default "delayedQueue.ratio" is same as "ratio"
Results
Able to configure recycler delayed queue drop ratio separately
Motivation
1. It's inable to collect all object because RATIO is always >=1 after
`safeFindNextPositivePowerOfTwo`
2. Enable drop object in `WeakOrderQueue`(commit:
71860e5b94) enlarge the drop ratio. We
can subtly control the overall drop ratio by using `io.netty.recycler.ratio` directly,
Modification
- Remove `safeFindNextPositivePowerOfTwo` before set the ratio
Results
Able to disable drop when recycle object
Motivation:
We have found out that ByteBufUtil.indexOf can be inefficient for substring search on
ByteBuf, both in terms of algorithm complexity (worst case O(needle.readableBytes *
haystack.readableBytes)), and in constant factor (esp. on Composite buffers).
With implementation of more performant search algorithms we have seen improvements on
the order of magnitude.
Modifications:
This change introduces three search algorithms:
1. Knuth Morris Pratt - classical textbook algorithm, a good default choice.
2. Bit mask based algorithm - stable performance on any input, but limited to maximum
search substring (the needle) length of 64 bytes.
3. Aho–Corasick - worse performance and higher memory consumption than [1] and [2], but
it supports multiple substring (the needles) search simultaneously, by inspecting every
byte of the haystack only once.
Each algorithm processes every byte of underlying buffer only once, they are implemented
as ByteProcessor.
Result:
Efficient search algorithms with linear time complexity available in Netty (I will share
benchmark results in a comment on a PR).
Motivation:
How we did wildcard matching was not correct according to RFC6125. Beside this our implementation was quite CPU heavy.
Modifications:
- Add new DomainWildcardMappingBuilder which correctly does wildcard matching. See https://tools.ietf.org/search/rfc6125#section-6.4
- Add unit tests
- Deprecate old implementations
Result:
Correctly implement wildcard matching and improve performance
Motivation:
Magic numbers seem hard to read or understand.
Modification:
Replace several magic numbers with named constants.
Result:
Improve readability and make it easier to maintain.
Motivation:
ThrowableUtil.stackTraceToString is an expensive method call. So I think a log level check before this logging statement is quite needed especially in a environment with the warning log disabled.
Modification:
Add log level check simply before logging.
Result:
Improve performance in a environment with the warning log disabled.
Motivation:
In general, we will close the debug log in a product environment. However, logging without external level check may still affect performance as varargs will need to allocate an array.
Modification:
Add log level check simply before logging.
Result:
Improve performance slightly in a product environment.
Motivation:
Some JVMs (like OpenJDK 8 on Windows) use a low resolution timer in System.nanoTime() and may return the same value more than once. This triggered an assertion failure when deadlineNanos was equal to nanoTime and AbstractScheduledEventExecutor#pollScheduledTask called #setConsumed.
Modifications:
With this change the assertion checks exactly the same condition as AbstractScheduledEventExecutor#pollScheduledTask, and will no longer fail under these circumstances.
Result:
Fixes#10070.
Motivation:
PromiseTask.isCancelled performs an unsynchronized read and so may trigger race-detectors. As this was just done for a small optimization which should not really make a lot of difference we should just remove it.
Modifications:
Remove unsynchronized read optimization
Result:
Fixes https://github.com/netty/netty/issues/10026.
Motivation:
ImmediateExecutor needs more test cases.
Modification:
Add several test cases for ImmediateExecutor.
Result:
Improve test coverage slightly.
Motivation:
Our parsing of the initial line / http headers did treat some characters as separators which should better trigger an exception during parsing.
Modifications:
- Tighten up parsing of the inital line by follow recommentation of RFC7230
- Restrict separators to OWS for http headers
- Add unit test
Result:
Stricter parsing of HTTP1
Motivation:
NetworkInterface.getByInetAddress() may return null on Android. This is incorrect by the API but still happens. To help our users we should provide a workaround
Modifications:
Just return an empty Enumeration when null is returned.
Result:
Fixes https://github.com/netty/netty/issues/10045
Motivation:
BufferedReader.readLine() may return null and cause a NPE.
Modification:
Simply add a null check.
Result:
If BufferedReader.readLine() returns null, the sysctlGetInt will just return null rather than cause NPE.
Motivation:
Modifications:
- Wrap the code and execute with an AccessController
- Ignore SecurityException (by just logging it)
- Add some more debug logging
Result:
Fixes https://github.com/netty/netty/issues/10017
Motivation:
GlobalEventExecutor/SingleThreadEventExecutor#taskQueue is BlockingQueue.
Modifications:
Add allowBlockingCallsInside configuration for GlobalEventExecutor/SingleThreadEventExecutor#takeTask.
Result:
Fixes#9984
When BlockHound is installed, GlobalEventExecutor/SingleThreadEventExecutor#takeTask is not reported as a blocking call.
