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From "Robert Joseph Evans (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 18:42:52 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13269864#comment-13269864
] 

Robert Joseph Evans commented on HDFS-3376:
-------------------------------------------

Hey Todd,

I have been trying to follow some of the fixes you have been putting into the HDFS socket
caching.  I was wondering if you would be willing to pull HDFS-3357 and this one, HDFS-3376,
into branch-0.23.  They both seem to apply cleanly, but I am not an HDFS committer to do this
myself.
                
> 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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