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https://issues.apache.org/jira/browse/HBASE-9393?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15092315#comment-15092315
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Ashish Singhi commented on HBASE-9393:
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We are able to reproduce this by executing the below simple scenario:
0. Check the total number of CLOSE_WAIT connections already existing for a RS
1. Create a table
2. Put a row
3. Flush the table (Ensure the store file is assigned to the same RS)
Now we can notice there will be a new CLOSE_WAIT connection.
>From initial analysis we found that for every HFile on a RS we have a
>CLOSE_WAIT connection to it. When we disable the table all the CLOSE_WAIT
>connections to it are closed and on enabling it we see again the CLOSE_WAIT
>connections to it.
The StoreFile$Reader has FSDataInputStreamWrapper which is open and not closed.
During disable of the table we saw that the close method is getting called. I
still need to check the reason behind keeping these open.
We have also checked that a HDFS client opening a connection to a file and not
closing that client will show up a new CLOSE_WAIT connection.
> 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 ...
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