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https://issues.apache.org/jira/browse/HBASE-11833?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14111775#comment-14111775
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Lars Hofhansl commented on HBASE-11833:
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[~stevenxu], did you ask about this on the mailing lists? You'll generally get
better answers there.
> Hbase does not closing a closed socket resulting in thousand of CLOSE_WAIT
> sockets
> ----------------------------------------------------------------------------------
>
> Key: HBASE-11833
> URL: https://issues.apache.org/jira/browse/HBASE-11833
> Project: HBase
> Issue Type: Bug
> Components: regionserver
> Affects Versions: 0.98.0
> Environment: RHEL 6.3 -HDP 2.1 -6 RegionServers/Datanode -18T per
> node -3108Regions
> Reporter: steven xu
>
> HBase dose not close a dead connection with the datanode.
> This resulting in over 30K+ 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:50010.
> After I restart all RSs, the count of CLOSE_WAIT will increase always.
> $ netstat -an|grep CLOSE_WAIT|wc -l
> 2545
> # netstat -nap|grep CLOSE_WAIT|grep 6569|wc -l
> 2545
> # ps -ef|grep 6569
> hbase 6569 6556 21 Aug25 ? 09:52:33 /opt/jdk1.6.0_25/bin/java
> -Dproc_regionserver -XX:OnOutOfMemoryError=kill -9 %p -Xmx1000m
> -XX:+UseConcMarkSweepGC
> I aslo have reviewed these issues:
> [HBASE-9393]
> [HDFS-5671|https://issues.apache.org/jira/browse/HDFS-5671]
> [HDFS-1836|https://issues.apache.org/jira/browse/HDFS-1836]
> I found HBase 0.98/Hadoop 2.4.0 I uesed which source codes are not different
> from these patches.
> But I donot understand why HBase 0.98/Hadoop 2.4.0 also have this isssue.
> Please check. Thanks a lot.
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