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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3376) DFSClient fails to make connection to DN if there are many unusable cached sockets
Date Mon, 07 May 2012 18:10:50 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13269828#comment-13269828
] 

Hudson commented on HDFS-3376:
------------------------------

Integrated in Hadoop-Mapreduce-trunk-Commit #2214 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk-Commit/2214/])
    HDFS-3376. DFSClient fails to make connection to DN if there are many unusable cached
sockets. Contributed by Todd Lipcon. (Revision 1335115)

     Result = ABORTED
todd : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1335115
Files : 
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSInputStream.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDataTransferKeepalive.java

                
> DFSClient fails to make connection to DN if there are many unusable cached sockets
> ----------------------------------------------------------------------------------
>
>                 Key: HDFS-3376
>                 URL: https://issues.apache.org/jira/browse/HDFS-3376
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs client
>    Affects Versions: 2.0.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Critical
>             Fix For: 2.0.0
>
>         Attachments: hdfs-3376.txt
>
>
> After fixing the datanode side of keepalive to properly disconnect stale clients, (HDFS-3357),
the client side has the following issue: when it connects to a DN, it first tries to use cached
sockets, and will try a configurable number of sockets from the cache. If there are more cached
sockets than the configured number of retries, and all of them have been closed by the datanode
side, then the client will throw an exception and mark the replica node as dead.

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