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https://issues.apache.org/jira/browse/HADOOP-3339?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12594497#action_12594497
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dhruba borthakur commented on HADOOP-3339:
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+1 on Raghu's proposal.
> DFS Write pipeline does not detect defective datanode correctly if it times
> out.
> --------------------------------------------------------------------------------
>
> Key: HADOOP-3339
> URL: https://issues.apache.org/jira/browse/HADOOP-3339
> Project: Hadoop Core
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.16.0
> Reporter: Raghu Angadi
> Assignee: Raghu Angadi
> Fix For: 0.18.0
>
>
> When DFSClient is writing to DFS, it does not correctly detect the culprit
> datanode (rather datanodes do not inform) properly if the bad node times out.
> Say, the last datanode in in 3 node pipeline is is too slow or defective. In
> this case, pipeline removes the first two datanodes in first two attempts.
> The third attempt has only the 3rd datanode in the pipeline and it will fail
> too. If the pipeline detects the bad 3rd node when the first failure occurs,
> the write will succeed in the second attempt.
> I will attach example logs of such cases. I think this should be fixed in
> 0.17.x.
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