Details
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Bug
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Resolution: Won't Do
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Major
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None
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None
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None
Description
We had a file descriptor leakage issue and believe it is rooted in this. We are not setting the WriteListener so we are performing a synchronous write according to the code. We are stuck at Channels.writeBlocking, which is called without a timeout.
We are able to reproduce this when the peer closes the connection as we are trying to reply. The call can block and return minutes later. We measured responses back up to 16 minutes later. Unfortunately this can cause thread exhaustion, high load, retries, escalating the "leak".
sdouglas1@redhat.com do you think having a configurable writeBlocking timeout would work? Something that would allow the write call to return in seconds and not minutes...
"XNIO-2 task-43" #228 prio=5 os_prio=0 tid=0x00002b768000f000 nid=0x6cc2 runnable [0x00002b73c3935000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.PollArrayWrapper.poll0(Native Method)
at sun.nio.ch.PollArrayWrapper.poll(PollArrayWrapper.java:115)
at sun.nio.ch.PollSelectorImpl.doSelect(PollSelectorImpl.java:87)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)
- locked <0x00000005ae13ccf8> (a sun.nio.ch.Util$3)
- locked <0x00000005ae13cce8> (a java.util.Collections$UnmodifiableSet)
- locked <0x00000005ae13cbc0> (a sun.nio.ch.PollSelectorImpl)
at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)
at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:101)
at org.xnio.nio.SelectorUtils.await(SelectorUtils.java:46)
at org.xnio.nio.NioSocketConduit.awaitWritable(NioSocketConduit.java:263)
at io.undertow.conduits.IdleTimeoutConduit.awaitWritable(IdleTimeoutConduit.java:366)
at org.xnio.conduits.AbstractSinkConduit.awaitWritable(AbstractSinkConduit.java:66)
at io.undertow.conduits.AbstractFixedLengthStreamSinkConduit.awaitWritable(AbstractFixedLengthStreamSinkConduit.java:282)
at org.xnio.conduits.ConduitStreamSinkChannel.awaitWritable(ConduitStreamSinkChannel.java:134)
at io.undertow.channels.DetachableStreamSinkChannel.awaitWritable(DetachableStreamSinkChannel.java:87)
at io.undertow.server.HttpServerExchange$WriteDispatchChannel.awaitWritable(HttpServerExchange.java:2033)
at org.xnio.channels.Channels.writeBlocking(Channels.java:154)
at io.undertow.servlet.spec.ServletOutputStreamImpl.writeTooLargeForBuffer(ServletOutputStreamImpl.java:197)
at io.undertow.servlet.spec.ServletOutputStreamImpl.write(ServletOutputStreamImpl.java:145)
at org.jboss.resteasy.plugins.server.servlet.HttpServletResponseWrapper$DeferredOutputStream.write(HttpServletResponseWrapper.java:46)
at org.jboss.resteasy.util.CommitHeaderOutputStream.write(CommitHeaderOutputStream.java:71)
