[Impala-ASF-CR] IMPALA-6497: add "Last row fetched" and AC events

["Tim Armstrong (Code Review)" <ge...@cloudera.org>]

Tim Armstrong has uploaded a new patch set (#2). ( http://gerrit.cloudera.org:8080/9271 )

Change subject: IMPALA-6497: add "Last row fetched" and AC events
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IMPALA-6497: add "Last row fetched" and AC events

This makes it more observable that all rows were returned to the client
and also that resources were released for admission control.

Testing:
Manually inspected some query profiles.

Added a basic observability test that ensures that the expected events
appear in the profile. Ran it in a loop for a bit to make sure it wasn't
flaky.

Change-Id: I32a707e4660061e75c86ad967f1fac6f6737da7e
---
M be/src/runtime/coordinator.cc
M tests/query_test/test_observability.py
2 files changed, 23 insertions(+), 2 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/71/9271/2
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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I32a707e4660061e75c86ad967f1fac6f6737da7e
Gerrit-Change-Number: 9271
Gerrit-PatchSet: 2
Gerrit-Owner: Tim Armstrong <ta...@cloudera.com>