Philip Zeyliger has posted comments on this change.

Change subject: IMPALA-3642: Adding backend addresses to error statuses for 
scratch failures.
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Patch Set 1:

I'm looking for feedback on whether we have more explicit ways to test this 
sort of thing. This only tackles one particular source of errors.

There are ~294 matches for Status.*Substitute, and of these some (like the 
runtime errors in filesystem-util.cc) could compellingly make a case for 
similar treatment. The way Statuses are propagated down to the query is not 
trivial, though one could add a "source host" field to the relevant Thrift 
structure and populate it for non-OK statuses in Status::ToThrift(). (Or, even 
just append it to any messages in an unstructured way.)

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Gerrit-MessageType: comment
Gerrit-Change-Id: If31a50fdf6031312d0348d48aeb8f9688274cac2
Gerrit-PatchSet: 1
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Philip Zeyliger <phi...@cloudera.com>
Gerrit-Reviewer: Philip Zeyliger <phi...@cloudera.com>
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