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From "Raghu Angadi (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-3007) DataNode pipelining : failure on mirror make results in failure on upstream datanode
Date Wed, 12 Mar 2008 21:24:46 GMT
DataNode pipelining : failure on mirror make results in failure on upstream datanode
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                 Key: HADOOP-3007
                 URL: https://issues.apache.org/jira/browse/HADOOP-3007
             Project: Hadoop Core
          Issue Type: Bug
          Components: dfs
    Affects Versions: 0.16.0
            Reporter: Raghu Angadi
            Priority: Blocker
             Fix For: 0.16.2



When datanode is transfering data to other datanodes (as opposed to a client write()), DN
currently receiving the data is supposed to continued to receive even if the downstream (mirror)
datanode fails.

I think there are two minor bugs in receiveBlock() :
# mirrorSock masks this.mirrorSock, which could be set to null by other members like receiveChunk()
to indicate failure.
# when this.mirrorSock is non null, failure to write to it at in receiveBlock() should be
handled same way as in receiveChunk().

I am not sure if this should block 0.16.1, but should surely block 0.16.2.

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