Mailing-List: contact issues-help@hbase.apache.org; run by ezmlm
Precedence: bulk
Date: Mon, 1 Sep 2014 04:44:22 +0000 (UTC)
From: "steven xu (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Message-ID: <JIRA.12666348.1377880286000.1383.1409546662028@Atlassian.JIRA>
In-Reply-To: <JIRA.12666348.1377880286000@Atlassian.JIRA>
References: <JIRA.12666348.1377880286000@Atlassian.JIRA>
 <JIRA.12666348.1377880286333@arcas>
Subject: [jira] [Commented] (HBASE-9393) Hbase does not closing a closed
 socket resulting in many CLOSE_WAIT
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit


    [ https://issues.apache.org/jira/browse/HBASE-9393?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14117017#comment-14117017 ] 

steven xu commented on HBASE-9393:
----------------------------------

I considered [cmccabe] suggestions. And I testes the following case:
* use short-circuit reads;
* set the socket cache to a bigger size ( dfs.client.socketcache.capacity = 1024) and adjust the timeouts to be longer 
But it didnot work, the numbers of CLOSE_WAIT also grown up quickly.

> 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
>
> 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 ...


--
This message was sent by Atlassian JIRA
(v6.3.4#6332)