Tim Armstrong has posted comments on this change.

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


Patch Set 1:

We have test coverage for scratch errors in a few places:

  be/src/runtime/bufferpool/buffer-pool-test.cc
  be/src/runtime/tmp-file-mgr-test.cc
  tests/custom_cluster/test_scratch_disk.py

There are a bunch of write error tests and a single read error test: 
BufferPoolTest::ScratchReadError

The backend unit tests check the error codes but not the error messages - one 
option is to extend them to check the error messages.

I haven't fully thought through how it would work out, but it might be easier 
to add this information to the error message in be/src/tmp-file-mgr.cc.  The 
write errors get rolled up into a SCRATCH_ALLOCATION_FAILED message (there may 
be more than one per disk). There are also a couple of other error types that 
emanate from that file: SCRATCH_LIMIT_EXCEEDED and SCRATCH_READ_TRUNCATED.

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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 <[email protected]>
Gerrit-Reviewer: Philip Zeyliger <[email protected]>
Gerrit-Reviewer: Tim Armstrong <[email protected]>
Gerrit-HasComments: No

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