sodonnel opened a new pull request #1001: HDDS-1258 - Fix error propagation for 
SCM protocol
URL: https://github.com/apache/hadoop/pull/1001
 
 
   Following on from HDDS-1674, which changed the SCMBlockLocationProtocol to 
use a single wrapper message for all child messages, this change ensures that 
any known SCMException's are caught and the correct code and message written to 
the wrapper.
   
   Note that the client does not see the benifit of the new error handling, as 
the generally the client calls CLIENT -> OM -> SCM, and even with this change 
the OM cannot translate the SCM response codes into a more meaningful error 
message for the client.

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