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From "Ashish Singhi (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-9393) Hbase does not closing a closed socket resulting in many CLOSE_WAIT
Date Sat, 13 Feb 2016 01:03:18 GMT

     [ https://issues.apache.org/jira/browse/HBASE-9393?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ashish Singhi updated HBASE-9393:
---------------------------------
    Release Note: 
To handle this issue user need to have Hadoop client 2.6.4 or 2.7.0+ Hadoop version as CanUnBuffer
interface which was added as part of HDFS-7694 is available in those versions only.
So from HBase side we have fixed this issue only in 2.0.0 version as by default the Hadoop
version used there is 2.7.1.
If a user is using Hadoop 2.6.4 or Hadoop 2.7.0+ version then they can back port this issue
in their version to handle this issue.

> 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
>            Priority: Critical
>             Fix For: 2.0.0
>
>         Attachments: HBASE-9393.patch, HBASE-9393.v1.patch, HBASE-9393.v2.patch, HBASE-9393.v3.patch,
HBASE-9393.v4.patch, HBASE-9393.v5.patch, HBASE-9393.v5.patch, HBASE-9393.v5.patch, HBASE-9393.v6.patch,
HBASE-9393.v6.patch, HBASE-9393.v6.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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