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From Dmitry Sivachenko <trtrmi...@gmail.com>
Subject Idle tasktracker eats CPU
Date Mon, 09 Jun 2014 09:15:06 GMT
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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