"Not enough xcievers" error should propagate to client
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Key: HDFS-1787
URL: https://issues.apache.org/jira/browse/HDFS-1787
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: Todd Lipcon
We find that users often run into the default transceiver limits in the DN.
Putting aside the inherent issues with xceiver threads, it would be nice if the
"xceiver limit exceeded" error propagated to the client. Currently, clients
simply see an EOFException which is hard to interpret, and have to go slogging
through DN logs to find the underlying issue.
The data transfer protocol should be extended to either have a special error
code for "not enough xceivers" or should have some error code for generic
errors with which a string can be attached and propagated.
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