NioProcessor 100% CPU usage on Linux (epoll selector bug)
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Key: DIRMINA-678
URL: https://issues.apache.org/jira/browse/DIRMINA-678
Project: MINA
Issue Type: Bug
Components: Core
Affects Versions: 2.0.0-M4
Environment: CentOS 5.x, 32/64-bit, 32/64-bit Sun JDK 1.6.0_12, also
_11/_10/_09 and Sun JDK 1.7.0 b50, Kernel 2.6.18-92.1.22.el5 and also older
versions,
Reporter: Serge Baranov
It's the same bug as described at http://jira.codehaus.org/browse/JETTY-937 ,
but affecting MINA in the very similar way.
NioProcessor threads start to eat 100% resources per CPU. After 10-30 minutes
of running depending on the load (sometimes after several hours) one of the
NioProcessor starts to consume all the available CPU resources probably
spinning in the epoll select loop. Later, more threads can be affected by the
same issue, thus 100% loading all the available CPU cores.
Sample trace:
NioProcessor-10 [RUNNABLE] CPU time: 5:15
sun.nio.ch.EPollArrayWrapper.epollWait(long, int, long, int)
sun.nio.ch.EPollArrayWrapper.poll(long)
sun.nio.ch.EPollSelectorImpl.doSelect(long)
sun.nio.ch.SelectorImpl.lockAndDoSelect(long)
sun.nio.ch.SelectorImpl.select(long)
org.apache.mina.transport.socket.nio.NioProcessor.select(long)
org.apache.mina.core.polling.AbstractPollingIoProcessor$Processor.run()
org.apache.mina.util.NamePreservingRunnable.run()
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor$Worker)
java.util.concurrent.ThreadPoolExecutor$Worker.run()
java.lang.Thread.run()
It seems to affect any NIO based Java server applications running in the
specified environment.
Some projects provide workarounds for similar JDK bugs, probably MINA can also
think about a workaround.
As far as I know, there are at least 3 users who experience this issue with
Jetty and all of them are running CentOS (some distribution default setting is
a trigger?). As for MINA, I'm not aware of similar reports yet.
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