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From Eran Kutner <e...@gigya.com>
Subject Re: CPU hits rootf with 3 streams of syslogTcp
Date Fri, 09 Sep 2011 19:45:20 GMT
I've seen very excessive CPU usage with 0.9.4 as well. You should really try
0.9.5, when I compiled the latest sources from trunk (taken from Apache) I
saw dramatic improvement in performance.

-eran



On Fri, Sep 9, 2011 at 19:30, Edward sanks <edsanks@hotmail.com> wrote:

>  Folks,
>
> Any idea why kicking 3 streams of syslogTcp takes flume process on 64-bit
>  centos5.4 to 120+%? This behavior continues even when the there is no more
> traffic. And it hits this condition on a large AWS machine with 7.5GB RAM.
> the amount of data transferred on these 3 streams was only few KB.
>
> I am running 0.9.4 distro. Let me know if I have missed any patches on top
> of this distro I should pick up.
>
> When stack is dumped for that process, I see exactly 6 threads in the
> following stack trace:
>
> Thread XXXXX: (state = IN_NATIVE)
>  - java.net.SocketInputStream.socketRead0(java.io.FileDescriptor, byte[],
> int, int, int) @bci=0 (Compiled frame; information may be imprecise)
>  - java.net.SocketInputStream.read(byte[], int, int) @bci=84, line=129
> (Compiled frame)
>  - java.io.BufferedInputStream.fill() @bci=175, line=218 (Compiled frame)
>  - java.io.BufferedInputStream.read1(byte[], int, int) @bci=44, line=258
> (Compiled frame)
>  - java.io.BufferedInputStream.read(byte[], int, int) @bci=49, line=317
> (Compiled frame)
>  - org.apache.thrift.transport.TIOStreamTransport.read(byte[], int, int)
> @bci=25, line=127 (Compiled frame)
>  - com.cloudera.flume.handlers.thrift.TStatsTransport.read(byte[], int,
> int) @bci=7, line=59 (Compiled frame)
>  - org.apache.thrift.transport.TTransport.readAll(byte[], int, int)
> @bci=22, line=84 (Compiled frame)
>  - org.apache.thrift.protocol.TBinaryProtocol.readAll(byte[], int, int)
> @bci=12, line=378 (Compiled frame)
>  - org.apache.thrift.protocol.TBinaryProtocol.readI32() @bci=52, line=297
> (Compiled frame)
>  - org.apache.thrift.protocol.TBinaryProtocol.readMessageBegin() @bci=1,
> line=204 (Compiled frame)
>  -
> com.cloudera.flume.handlers.thrift.ThriftFlumeEventServer$Processor.process(org.apache.thrift.protocol.TProtocol,
> org.apache.thrift.protocol.TProtocol) @bci=1, line=224 (Interpreted frame)
>  - org.apache.thrift.server.TSaneThreadPoolServer$WorkerProcess.run()
> @bci=150, line=280 (Interpreted frame)
>  -
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(java.lang.Runnable)
> @bci=59, line=886 (Interpreted frame)
>  - java.util.concurrent.ThreadPoolExecutor$Worker.run() @bci=28, line=908
> (Interpreted frame)
>  - java.lang.Thread.run() @bci=11, line=662 (Interpreted frame)
>
> Thanks,
> Ed.
>
>

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