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https://issues.apache.org/jira/browse/HDFS-2512?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13140519#comment-13140519
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Todd Lipcon commented on HDFS-2512:
-----------------------------------
The failing tests have been failing for several builds.
> Add textual error message to data transfer protocol responses
> -------------------------------------------------------------
>
> Key: HDFS-2512
> URL: https://issues.apache.org/jira/browse/HDFS-2512
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: data-node, hdfs client
> Affects Versions: 0.23.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Attachments: hdfs-2512.txt
>
>
> Currently, the error response code from the DN has very little extra info. I
> had a situation the other day where the balancer was failing to move blocks,
> but just reported back "error moving block", which didn't help much. We can
> easily add a "message" field to OpBlockResponseProto to communicate back the
> underlying issue (in this case, it was thread quota exceeded)
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