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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-5724) Datanode should report deletion of blocks to Namenode explicitly
Date Wed, 22 Apr 2009 21:20:47 GMT
Datanode should report deletion of blocks to Namenode explicitly
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                 Key: HADOOP-5724
                 URL: https://issues.apache.org/jira/browse/HADOOP-5724
             Project: Hadoop Core
          Issue Type: Bug
            Reporter: Suresh Srinivas
            Assignee: Suresh Srinivas
             Fix For: 0.21.0


Currently datanode notifies namenode newly added blocks and the blocks that are corrupt. There
is no explicit message from the datanode to the namenode to indicate the deletion of blocks.
Block reports from the datanode is the only way for the namenode to learn about the deletion
of blocks at a datanode. With the addition of explicit request to indicate to block deletion,
block report interval (which is currently 1 hour) can be increased to a longer duration. This
reduces load on both namenode and datanodes.
 

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