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From "Ravikumar (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-11540) PeerCache sync overhead
Date Fri, 17 Mar 2017 10:16:41 GMT
Ravikumar created HDFS-11540:

             Summary: PeerCache sync overhead
                 Key: HDFS-11540
                 URL: https://issues.apache.org/jira/browse/HDFS-11540
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: hdfs-client
    Affects Versions: 2.7.1
            Reporter: Ravikumar
            Priority: Minor

PeerCache has a fair amount sync over-head. In addition to class level locking, expired sockets
& eldest socket are closed in critical section during gets & puts respectively..

A ConcurrentLinkedHashMap with appropriate fencing using DatanodeID could speed it up?

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