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From Serge Blazhievsky <hadoop...@gmail.com>
Subject Re: Idle tasktracker eats CPU
Date Tue, 10 Jun 2014 01:58:42 GMT
There are ongoing pings to jobtracker 

But 10% seems high

Sent from my iPhone

> On Jun 9, 2014, at 2:15, Dmitry Sivachenko <trtrmitya@gmail.com> wrote:
> 
> Hello!
> 
> I set up hadoop-1.2.1 on FreeBSD-10/stable with openjdk version 1.7.0_60.
> 
> On the first glance it is doing well except one annoying thing:  after executing some
tasks, tasktracker process starts to eat CPU when idle.
> Sometimes it is 10-20% (numbers from top(1) output), sometimes it is 100-150%.
> 
> In tasktrackers's log I see numerious records like this:
> 
> 2014-06-09 13:08:29,858 INFO org.mortbay.log: org.mortbay.io.nio.SelectorManager$SelectSet@abdcc1c
JVM BUG(s) - injecting delay59 times
> 2014-06-09 13:08:29,859 INFO org.mortbay.log: org.mortbay.io.nio.SelectorManager$SelectSet@abdcc1c
JVM BUG(s) - recreating selector 59 times, canceled keys 944 times
> 2014-06-09 13:09:29,862 INFO org.mortbay.log: org.mortbay.io.nio.SelectorManager$SelectSet@abdcc1c
JVM BUG(s) - injecting delay58 times
> 2014-06-09 13:09:29,862 INFO org.mortbay.log: org.mortbay.io.nio.SelectorManager$SelectSet@abdcc1c
JVM BUG(s) - recreating selector 58 times, canceled keys 928 times
> 2014-06-09 13:10:29,901 INFO org.mortbay.log: org.mortbay.io.nio.SelectorManager$SelectSet@abdcc1c
JVM BUG(s) - injecting delay58 times
> 2014-06-09 13:10:29,901 INFO org.mortbay.log: org.mortbay.io.nio.SelectorManager$SelectSet@abdcc1c
JVM BUG(s) - recreating selector 58 times, canceled keys 928 times
> 
> 
> Is it a known thing?  Is there any workaround available?
> 
> Thanks in advance.

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