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https://issues.apache.org/jira/browse/HBASE-9393?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15109820#comment-15109820
]
Ted Yu commented on HBASE-9393:
-------------------------------
Test failures were due to:
{code}
testSeekTo[4](org.apache.hadoop.hbase.io.hfile.TestSeekTo) Time elapsed: 0.033
sec <<< ERROR!
java.lang.UnsupportedOperationException: this stream does not support
unbuffering.
at
org.apache.hadoop.fs.FSDataInputStream.unbuffer(FSDataInputStream.java:229)
at
org.apache.hadoop.fs.FSDataInputStream.unbuffer(FSDataInputStream.java:227)
at
org.apache.hadoop.hbase.io.hfile.HFile.pickReaderVersion(HFile.java:518)
at org.apache.hadoop.hbase.io.hfile.HFile.createReader(HFile.java:562)
at
org.apache.hadoop.hbase.io.hfile.TestSeekTo.testSeekToInternals(TestSeekTo.java:307)
at
org.apache.hadoop.hbase.io.hfile.TestSeekTo.testSeekTo(TestSeekTo.java:298)
{code}
Here was the cause:
{code}
java.lang.ClassCastException: org.apache.hadoop.fs.BufferedFSInputStream cannot
be cast to org.apache.hadoop.fs.CanUnbuffer
{code}
BufferedFSInputStream currently doesn't implement CanUnbuffer.
After discussion with [~cmccabe], I logged HADOOP-12724
> 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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