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https://issues.apache.org/jira/browse/HDFS-6867?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14118352#comment-14118352
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Zhe Zhang commented on HDFS-6867:
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[~cmccabe] Could you help review the patch? In the patch I created a new
{{ReplaceDatanodeOnFailure}} policy named {{BACKGROUND}}, for the user to
specify that background recovery should be used -- which we didn't cover in the
offline discussion but I think is necessary.
> For DFSOutputStream, do pipeline recovery for a single block in the background
> ------------------------------------------------------------------------------
>
> Key: HDFS-6867
> URL: https://issues.apache.org/jira/browse/HDFS-6867
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs-client
> Reporter: Colin Patrick McCabe
> Assignee: Zhe Zhang
> Attachments: HDFS-6867-20140827-2.patch, HDFS-6867-20140827-3.patch,
> HDFS-6867-20140827.patch, HDFS-6867-20140828-1.patch,
> HDFS-6867-20140828-2.patch, HDFS-6867-design-20140820.pdf,
> HDFS-6867-design-20140821.pdf, HDFS-6867-design-20140822.pdf,
> HDFS-6867-design-20140827.pdf
>
>
> For DFSOutputStream, we should be able to do pipeline recovery in the
> background, while the user is continuing to write to the file. This is
> especially useful for long-lived clients that write to an HDFS file slowly.
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