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From "Dennis Cheung (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-1836) Thousand of CLOSE_WAIT socket
Date Thu, 14 Apr 2011 07:41:05 GMT
Thousand of CLOSE_WAIT socket 

                 Key: HDFS-1836
                 URL: https://issues.apache.org/jira/browse/HDFS-1836
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: hdfs client
    Affects Versions: 0.20.2
         Environment: Linux 2.6.18-194.32.1.el5 #1 SMP Wed Jan 5 17:52:25 EST 2011 x86_64
x86_64 x86_64 GNU/Linux
java version "1.6.0_23"
Java(TM) SE Runtime Environment (build 1.6.0_23-b05)
Java HotSpot(TM) 64-Bit Server VM (build 19.0-b09, mixed mode)

            Reporter: Dennis Cheung

$ /usr/sbin/lsof -i TCP:50010 | grep -c CLOSE_WAIT

It is better if everything runs normal. 
However, from time to time there are some "DataStreamer Exception: java.net.SocketTimeoutException"
and "DFSClient.processDatanodeError(2507) | Error Recovery for" can be found from log file
and the number of CLOSE_WAIT socket just keep increasing

The CLOSE_WAIT handles may remain for hours and days; then "Too many open file" some day.

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