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From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-5203) Concurrent clients that add a cache directive on the same path may prematurely uncache from each other.
Date Fri, 13 Sep 2013 21:05:51 GMT
Chris Nauroth created HDFS-5203:
-----------------------------------

             Summary: Concurrent clients that add a cache directive on the same path may prematurely
uncache from each other.
                 Key: HDFS-5203
                 URL: https://issues.apache.org/jira/browse/HDFS-5203
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: namenode
    Affects Versions: HDFS-4949
            Reporter: Chris Nauroth


When a client adds a cache directive, we assign it a unique ID and return that ID to the client.
 If multiple clients add a cache directive for the same path, then we return the same ID.
 If one client then removes the cache entry for that ID, then it is removed for all clients.
 Then, when this change becomes visible in subsequent cache reports, the datanodes may {{munlock}}
the block before the other clients are done with it.

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