Motivation:
We need to support SO_TIMEOUT for the OioDatagramChannel but we miss this atm as we not have special handling for it in the DatagramChannelConfig impl that we use. Because of this the following log lines showed up when running the testsuite:
20:31:26.299 [main] WARN io.netty.bootstrap.Bootstrap - Unknown channel option 'SO_TIMEOUT' for channel '[id: 0x7cb9183c]'
Modifications:
- Add OioDatagramChannelConfig and impl
- Correctly set SO_TIMEOUT in testsuite
Result:
Support SO_TIMEOUT for OioDatagramChannel and so faster execution of datagram related tests in the testsuite
Motivation:
Implementations of DuplexChannel delegate the shutdownOutput to the underlying transport, but do not take any action on the ChannelOutboundBuffer. In the event of a write failure due to the underlying transport failing and application may attempt to shutdown the output and allow the read side the transport to finish and detect the close. However this may result in an issue where writes are failed, this generates a writability change, we continue to write more data, and this may lead to another writability change, and this loop may continue. Shutting down the output should fail all pending writes and not allow any future writes to avoid this scenario.
Modifications:
- Implementations of DuplexChannel should null out the ChannelOutboundBuffer and fail all pending writes
Result:
More controlled sequencing for shutting down the output side of a channel.
Motivation:
When a user called ctx.close() and used the EmbeddedChannel we did not correctly run all pending tasks which means channelInactive was never called.
Modifications:
Ensure we run all pending tasks after all operations that may change the Channel state and are part of the Channel.Unsafe impl.
Result:
Fixes [#6894].
Motivation:
ErrorProne complains that the array override doesn't match the
vararg super call. See http://errorprone.info/bugpattern/Overrides
Additionally, almost every other Future uses the vararg form, so
it would be stylistically consistent to keep it that way.
Modifications:
Use vararg override.
Result:
Cleaner, less naggy code.
Motivation:
DefaultChannelPipeline.estimatorHandle needs to be volatile as its accessed from different threads.
Modifications:
Make DefaultChannelPipeline.estimatorHandle volatile and correctly init it via CAS
Result:
No more race.
Motivation:
We previously used pollLast() to retrieve a Channel from the queue that backs SimpleChannelPool. This could lead to the problem that some Channels are very unfrequently used and so when these are used the connection was already be closed and so could not be reused.
Modifications:
Allow to configure if the last recent used Channel should be used or the "oldest".
Result:
More flexible usage of ChannelPools
Motivation:
Some ChannelOptions must be set before the Channel is really registered to have the desired effect.
Modifications:
Add another constructor argument which allows to not register the EmbeddedChannel to its EventLoop until the user calls register().
Result:
More flexible usage of EmbeddedChannel. Also Fixes [#6968].
Motivation:
We had recently a report that the issue [#6607] is still not fixed.
Modifications:
Add a testcase to prove the issue is fixed.
Result:
More tests.
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
Motivation:
Each call to SSL_write may introduce about ~100 bytes of overhead. The OpenSslEngine (based upon OpenSSL) is not able to do gathering writes so this means each wrap operation will incur the ~100 byte overhead. This commit attempts to increase goodput by aggregating the plaintext in chunks of <a href="https://tools.ietf.org/html/rfc5246#section-6.2">2^14</a>. If many small chunks are written this can increase goodput, decrease the amount of calls to SSL_write, and decrease overall encryption operations.
Modifications:
- Introduce SslHandlerCoalescingBufferQueue in SslHandler which will aggregate up to 2^14 chunks of plaintext by default
- Introduce SslHandler#setWrapDataSize to control how much data should be aggregated for each write. Aggregation can be disabled by setting this value to <= 0.
Result:
Better goodput when using SslHandler and the OpenSslEngine.
Motivation:
The behaviour of the FixedChannelPool.release was inconsistent with the
SimpleChannelPool implementation, in that given promise is returned.
In the FixedChannelPool implementation a new promise was return and
this meant that the completion of that promise can be different.
Specifically on releasing a channel to a closed pool, the parameter
promise is failed with an IllegalStateException but the returned one
will have been successful (as it was completed by call to super
.release)
Modification:
Return the given promise as the result of FixedChannelPool.release
Result:
Returned promise will reflect the result of the release operation.
Motivation:
Channels returned to a FixedChannelPool after closing it remain active.
Since channels that where acquired from the pool are not closed during the close operation, they remain open even after releasing the channel back to the pool where they are then in accessible and become in-effect a connection leak.
Modification:
Close the released channel on releasing back to a closed pool.
Result:
Much harder to create a connection leak by closing an active
FixedChannelPool instance.
Motivation:
We should not fail the promise when a closed Channel is offereed back to the ChannelPool as we explicit mention that the Channel must always be returned.
Modifications:
- Not fail the promise
- Add test-case
Result:
Fixes [#6831]
Motivation:
ChannelPipeline will happily add a handler to a closed Channel's pipeline and will call handlerAdded(...) but will not call handlerRemoved(...).
Modifications:
Check if pipeline was destroyed and if so not add the handler at all but propergate an exception.
Result:
Fixes [#6768]
Motivation:
We currently don't have a native transport which supports kqueue https://www.freebsd.org/cgi/man.cgi?query=kqueue&sektion=2. This can be useful for BSD systems such as MacOS to take advantage of native features, and provide feature parity with the Linux native transport.
Modifications:
- Make a new transport-native-unix-common module with all the java classes and JNI code for generic unix items. This module will build a static library for each unix platform, and included in the dynamic libraries used for JNI (e.g. transport-native-epoll, and eventually kqueue).
- Make a new transport-native-unix-common-tests module where the tests for the transport-native-unix-common module will live. This is so each unix platform can inherit from these test and ensure they pass.
- Add a new transport-native-kqueue module which uses JNI to directly interact with kqueue
Result:
JNI support for kqueue.
Fixes https://github.com/netty/netty/issues/2448
Fixes https://github.com/netty/netty/issues/4231
This fixes#6652.
Rationale
The invocation of initChannel of ChannelInitializer has been moved to as
early as during handlerAdded is invoked in 26aa34853, whereas it was
only invoked during channelRegistered is invoked before that. So the
comment does not describe how handlers are added in normal circumstances
anymore.
However, the code is kept as-is since there might be unusual cases, and
adding ServerBootstrapAcceptor via the event loop is always safe to
enforce the correct order.
Motivation:
In cases when an application is running in a container or is otherwise
constrained to the number of processors that it is using, the JVM
invocation Runtime#availableProcessors will not return the constrained
value but rather the number of processors available to the virtual
machine. Netty uses this number in sizing various resources.
Additionally, some applications will constrain the number of threads
that they are using independenly of the number of processors available
on the system. Thus, applications should have a way to globally
configure the number of processors.
Modifications:
Rather than invoking Runtime#availableProcessors, Netty should rely on a
method that enables configuration when the JVM is started or by the
application. This commit exposes a new class NettyRuntime for enabling
such configuraiton. This value can only be set once. Its default value
is Runtime#availableProcessors so that there is no visible change to
existing applications, but enables configuring either a system property
or configuring during application startup (e.g., based on settings used
to configure the application).
Additionally, we introduce the usage of forbidden-apis to prevent future
uses of Runtime#availableProcessors from creeping. Future work should
enable the bundled signatures and clean up uses of deprecated and
other forbidden methods.
Result:
Netty can be configured to not use the underlying number of processors,
but rather the constrained number of processors.
Motivation:
We need to release all the buffers that may be put into our inbound queue since we closed the Channel to ensure we not leak any memory. This is fine as it basically gives the same guarantees as TCP which means even if the promise was notified before its not really guaranteed that the "remote peer" will see the buffer at all.
Modifications:
Ensure we release all buffers in the inbound buffer if a doClose() is called.
Result:
No more leaks.
Motivation:
1. The use of InternetProtocolFamily is not consistent:
the DnsNameResolverContext and DnsNameResolver contains switches
instead of appropriate methods usage.
2. The InternetProtocolFamily class contains redundant switches in the
constructor.
Modifications:
1. Replacing switches to the use of an appropriate methods.
2. Simplifying the InternetProtocolFamily constructor.
Result:
Code is cleaner and simpler.
Motivation:
When a VoidChannelPromise is used by the user we need to ensure we propergate the exception through the ChannelPipeline otherwise the exception will just be swallowed and so the user has no idea whats going on.
Modifications:
- Always call tryFailure / trySuccess even when we use the VoidChannelPromise
- Add unit test
Result:
Fixes [#6622].
Motivation:
Commit 795f318 simplified some code related to the special case Set for the selected keys and introduced a Selector wrapper to make sure this set was properly reset. However the JDK makes assumptions about the type of Selector and this type is not extensible. This means whenever we call into the JDK we must provide the unwrapped version of the Selector or we get a ClassCastException. We missed a case of unwrapping in NioEventLoop#rebuildSelector0.
Modificaitons:
- NioEventLoop#openSelector should return a tuple so we can atomically set the wrapped and unwrapped Selector
- NioEventLoop#rebuildSelector0 should use the unwrapped version of the selector
Result:
Fixes https://github.com/netty/netty/issues/6607.
Motivation:
The code accidentally passes channel twice instead of value, resulting in logs like:
Failed to set channel option 'SO_SNDBUF' with value '[id: 0x2c5b2eb4]' for channel '[id: 0x2c5b2eb4]'
Modifications:
Pass value instead of channel where it needs to be.
Result:
Failed to set channel option 'SO_SNDBUF' with value '0' for channel '[id: 0x9bd3c5b8]'
Motivation:
We forked a new process to detect if the program is run by root. We should better just use user.name system property
Modifications:
- Change PlatformDependent.isRoot0() to read the user.name system property to detect if root runs the program and rename it to maybeSuperUser0().
- Rename PlatformDependent.isRoot() to maybeSuperUser() and let it init directly in the static block
Result:
Less heavy way to detect if the program is run by root.
Make the FileRegion comments about which transports are supported more accurate.
Also, eleminate any outstanding references to FileRegion.transfered as the method was renamed for spelling.
Modifications:
Class-level comment on FileRegion, can call renamed method.
Result:
More accurate documentation and less calls to deprecated methods.
Motivation:
There are numerous usages of internalNioBuffer which hard code 0 for the index when the intention was to use the readerIndex().
Modifications:
- Remove hard coded 0 for the index and use readerIndex()
Result:
We are less susceptible to using the wrong index, and don't make assumptions about the ByteBufAllocator.
Motivation:
Calling a static method is faster then dynamic
Modifications:
Add 'static' keyword for methods where it missed
Result:
A bit faster method calls
Motivation:
When "Too many open files" happens,the URLClassLoader cannot do any classloading because URLClassLoader need a FD for findClass. Because of this the anonymous inner class that is created to re-enable auto read may cause a problem.
Modification:
Pre-create Runnable that is scheduled and so ensure it is not lazy loaded.
Result:
No more problems when try to recover.
Motivation:
We have our own ThreadLocalRandom implementation to support older JDKs . That said we should prefer the JDK provided when running on JDK >= 7
Modification:
Using ThreadLocalRandom implementation of the JDK when possible.
Result:
Make use of JDK implementations when possible.
Motivation:
SelectedSelectionKeySet currently uses 2 arrays internally and users are expected to call flip() to access the underlying array and switch the active array. However we do not concurrently use 2 arrays at the same time and we can get away with using a single array if we are careful about when we reset the elements of the array.
Modifications:
- Introduce SelectedSelectionKeySetSelector which wraps a Selector and ensures we reset the underlying SelectedSelectionKeySet data structures before we select
- The loop bounds in NioEventLoop#processSelectedKeysOptimized can be defined more precisely because we know the real size of the underlying array
Result:
Fixes https://github.com/netty/netty/issues/6058
Motiviation:
Simplify implementation of compareTo/equals/hashCode for ChannelIds.
Modifications:
We simplfy the hashCode implementation for DefaultChannelId by not
making it random, but making it based on the underlying data. We fix the
compareTo implementation for DefaultChannelId by using lexicographic
comparison of the underlying data array. We fix the compareTo
implementation for CustomChannelId to avoid the possibility of overflow.
Result:
Cleaner code that is easier to maintain.
Motivation:
Initialization of PlatformDependent0 fails on Java 9 in static initializer when calling setAccessible(true).
Modifications:
Add RefelectionUtil which can be used to safely try if setAccessible(true) can be used or not and if not fail back to non reflection.
Result:
Fixed [#6345]
