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Date: Sat, 5 May 2012 21:11:50 +0000 (UTC)
From: "Todd Lipcon (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Created] (HDFS-3376) DFSClient fails to make connection to
 DN if there are many unusable cached sockets
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Todd Lipcon created HDFS-3376:
---------------------------------

             Summary: 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


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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