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Date: Wed, 20 Jan 2016 13:26:39 +0000 (UTC)
From: "Ashish Singhi (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Message-ID: <JIRA.12666348.1377880286000.158194.1453296399946@Atlassian.JIRA>
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 <JIRA.12666348.1377880286333@arcas>
Subject: [jira] [Commented] (HBASE-9393) Hbase does not closing a closed
 socket resulting in many CLOSE_WAIT
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    [ https://issues.apache.org/jira/browse/HBASE-9393?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15108531#comment-15108531 ] 

Ashish Singhi commented on HBASE-9393:
--------------------------------------

We did not observe any performance impact with the patch in our two PE run of randomReads for 1 million row. So I have attached the patch which mainly has two lines of code change rest all are code formatting changes. As we did not see any impact I did not made it configurable. If reviewer think otherwise then I am open for making it configurable and suggesting the configuration name will be appreciated.
Please review.

> Hbase does 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, 0.98.0
>         Environment: Centos 6.4 - 7 regionservers/datanodes, 8 TB per node, 7279 regions
>            Reporter: Avi Zrachya
>            Assignee: Ashish Singhi
>         Attachments: HBASE-9393.patch
>
>
> 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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