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https://issues.apache.org/jira/browse/HBASE-9393?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15116725#comment-15116725
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Anoop Sam John commented on HBASE-9393:
---------------------------------------
bq.Adding the below as finally in a method named pickReaderVersion seems a bit
odd... is pickReaderVersion only place we read in the file trailer? That seems
odd (not your issue Ashish Singhi). You'd think we'd want to keep the trailer
around in the reader.
We do read FFT in isHFileFormat() method also. This is used for a check on an
HFile which is being bulk loaded (LoadIncrementalHFiles)
Actually reading the FFT, we can do as pread. Now it is seek and then read. In
this method of pickReaderVersion, we actually create the HFileReader also which
will read the root level index blocks, bloom block etc. Those are also done as
seek + read (reading blocks) which is fine IMO.
May be we should at least rename this method pickReaderVersion ?
> 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 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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