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From "Avi Zrachya (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-9393) Hbase dose not closing a closed socket resulting in many CLOSE_WAIT
Date Sun, 01 Sep 2013 07:35:52 GMT

    [ https://issues.apache.org/jira/browse/HBASE-9393?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13755675#comment-13755675
] 

Avi Zrachya commented on HBASE-9393:
------------------------------------

Yes, it is most definetly the regionserver as you can see below.
pid 21592 is the pid the holding the CLOSE_WAIT socket and as you can see 21592 is the regionserver.

{code}
[root@hd2-region3 ~]# netstat -nap |grep CLOSE_WAIT |grep 21592 |wc -l
13156
[root@hd2-region3 ~]# ps -ef |grep 21592
root 17255 17219 0 12:26 pts/0 00:00:00 grep 21592
hbase 21592 1 17 Aug29 ? 03:29:06 /usr/java/jdk1.6.0_26/bin/java -XX:OnOutOfMemoryError=kill
-9 %p -Xmx8000m -ea -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -Dhbase.log.dir=/var /log/hbase
-Dhbase.log.file=hbase-hbase-regionserver-hd2-region3.swnet.corp.log ..
{code}
                
> Hbase dose not closing a closed socket resulting in many CLOSE_WAIT 
> --------------------------------------------------------------------
>
>                 Key: HBASE-9393
>                 URL: https://issues.apache.org/jira/browse/HBASE-9393
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.94.2
>         Environment: Centos 6.4 - 7 regionservers/datanodes, 8 TB per node, 7279 regions
>            Reporter: Avi Zrachya
>
> HBase dose not close a dead connection with the datanode.
> This resulting in over 60K CLOSE_WAIT and at some point HBase can not connect to the
datanode because too many mapped sockets from one host to another on the same port.
> The example below is with low CLOSE_WAIT count because we had to restart hbase to solve
the porblem, later in time it will incease to 60-100K sockets on CLOSE_WAIT
> [root@hd2-region3 ~]# netstat -nap |grep CLOSE_WAIT |grep 21592 |wc -l
> 13156
> [root@hd2-region3 ~]# ps -ef |grep 21592
> root     17255 17219  0 12:26 pts/0    00:00:00 grep 21592
> hbase    21592     1 17 Aug29 ?        03:29:06 /usr/java/jdk1.6.0_26/bin/java -XX:OnOutOfMemoryError=kill
-9 %p -Xmx8000m -ea -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -Dhbase.log.dir=/var/log/hbase
-Dhbase.log.file=hbase-hbase-regionserver-hd2-region3.swnet.corp.log ...

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