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From Stack <st...@duboce.net>
Subject Re: Thread leak // Hmaster has some warn logs.
Date Mon, 16 May 2011 18:47:05 GMT
2011/5/15 Gaojinchao <gaojinchao@huawei.com>:
> I try to reproduce the issue that socket is close_wait and find a new issue thread leak
for hmaster process.
>

We are leaking threads?  What thread (Can you diff thread dumps and
see what the name of the new thread is?  That would be a clue).


> In this case, It seems LogSyncer thread can't be closed
> Hlog can't be closed when use api createHRegion.
>

Why not?  It looks like its a daemon thread.  Is it stuck in a wait?



> It also find some CLOSE_WAIT. But I am not sure what' up.
> I need keep digging.
>
> tcp      227      0 157.5.100.1:60000       157.5.100.1:52780       CLOSE_WAIT
> tcp        1      0 157.5.100.1:60000       157.5.100.5:56633       CLOSE_WAIT
> tcp      233      0 157.5.100.1:60000       157.5.100.4:50772       CLOSE_WAIT
> tcp      227      0 157.5.100.1:60000       157.5.100.1:59921       CLOSE_WAIT
> tcp      233      0 157.5.100.1:60000       157.5.100.3:37877       CLOSE_WAIT
> tcp      233      0 157.5.100.1:60000       157.5.100.5:57556       CLOSE_WAIT
> tcp      233      0 157.5.100.1:60000       157.5.100.5:44967       CLOSE_WAIT
> tcp      233      0 157.5.100.1:60000       157.5.100.3:45944       CLOSE_WAIT
> C4C1:/opt/hbasetools # netstat -an |grep 60000 | grep CLOSE_WAIT | wc -l
> 140
>

Do please keep digging.
St.Ack

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