Add textual error message to data transfer protocol responses
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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
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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