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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-5479) NameNode should not send empty block replication request to DataNode
Date Thu, 12 Mar 2009 18:02:50 GMT
NameNode should not send empty block replication request to DataNode
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                 Key: HADOOP-5479
                 URL: https://issues.apache.org/jira/browse/HADOOP-5479
             Project: Hadoop Core
          Issue Type: Bug
          Components: dfs
            Reporter: Hairong Kuang
            Assignee: Hairong Kuang
            Priority: Blocker
             Fix For: 0.19.2, 0.20.0, 0.21.0


On our production clusters, we occasionally see that NameNode sends an empty block replication
request to DataNode on  every heartbeat, thus blocking this DataNode from replicating or deleting
any block.

This is partly caused by DataNode sending a wrong number of replications in progress which
will be fixed by HADOOP-5465. There is also a flaw at the NameNode side. NameNode should not
interpret the number of replications in progress as the number of targets since replication
is done through a pipeline. It also should make sure that no empty replication request is
sent to DataNode.

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