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From Brock Noland <br...@cloudera.com>
Subject Re: java.lang.OutOfMemoryError: unable to create new native thread
Date Wed, 27 Nov 2013 14:54:24 GMT
Sounds like the nproc ulimit...

On Tue, Nov 26, 2013 at 8:50 PM, Jeff Lord <jlord@cloudera.com> wrote:
> Can you provide the logfile and config?
>
>
> On Tue, Nov 26, 2013 at 12:20 PM, Cochran, David <david.cochran@bsee.gov>
> wrote:
>>
>> I've got a pretty good sized box collecting logs for a number of sources
>> (about a dozen or so).
>> Actually two instances were running on this box (one production and the
>> other a testing environment)
>>
>> After adding a dozen more log files i'm running into this error (87 logs
>> for PROD and 70 or so for Testing)
>>
>> Nov 26, 2013 10:25:27 AM
>> org.jboss.netty.channel.socket.nio.NioServerSocketPipelineSink
>> WARNING: Failed to accept a connection.
>> java.lang.OutOfMemoryError: unable to create new native thread
>> at java.lang.Thread.start0(Native Method)
>> at java.lang.Thread.start(Thread.java:640)
>> at
>> java.util.concurrent.ThreadPoolExecutor.addIfUnderMaximumPoolSize(ThreadPoolExecutor.java:727)
>> at
>> java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:657)
>> at
>> org.jboss.netty.channel.socket.nio.AbstractNioWorker.start(AbstractNioWorker.java:160)
>> at
>> org.jboss.netty.channel.socket.nio.AbstractNioWorker.register(AbstractNioWorker.java:131)
>> at
>> org.jboss.netty.channel.socket.nio.NioServerSocketPipelineSink$Boss.registerAcceptedChannel(NioServerSocketPipelineSink.java:269)
>> at
>> org.jboss.netty.channel.socket.nio.NioServerSocketPipelineSink$Boss.run(NioServerSocketPipelineSink.java:231)
>> at
>> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
>> at
>> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
>> at java.lang.Thread.run(Thread.java:662)
>>
>> I have been able to confirm that they are not bumping into the OS ulimit,
>> and increasing the sizes of the JVM does not make this go away
>> (JAVA_OPTS="-Xms1g -Xmx6g -Dcom.sun.management.jmxremot").  I ended up
>> having to shut down the testing environment instance so as not to lose any
>> more production logs.
>>
>> The box is 16 CPU with 16G RAM using local disks, running RHEL5.x
>>
>> Anytime process threads exceed ~930 (the results of  ps -eLF -u flume | wc
>> -l )the above error appears...if allowed to continue ultimately crashes the
>> box.
>>
>> Any ideas on resolving this issue or have I run into a thread limit that
>> cannot be gotten around without adding another server?
>>
>> Thanks,
>> Dave
>>
>



-- 
Apache MRUnit - Unit testing MapReduce - http://mrunit.apache.org

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