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From "Jing Zhao (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-5020) Make DatanodeProtocol#blockReceivedAndDeleted idempotent
Date Mon, 22 Jul 2013 23:46:51 GMT
Jing Zhao created HDFS-5020:
-------------------------------

             Summary: Make DatanodeProtocol#blockReceivedAndDeleted idempotent
                 Key: HDFS-5020
                 URL: https://issues.apache.org/jira/browse/HDFS-5020
             Project: Hadoop HDFS
          Issue Type: Improvement
    Affects Versions: 3.0.0
            Reporter: Jing Zhao
            Assignee: Jing Zhao


Currently DatanodeProtocol#blockReceivedAndDeleted is not idempotent because pending replication
maps in NN only tracks the number of the pending replicas, and a retry request can cause the
pending number decreased more than once. We can make blockReceivedAndDeleted idempotent by
tracking corresponding datanodes in the pending replication map. 

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