Sahil Takiar has uploaded this change for review. ( 
http://gerrit.cloudera.org:8080/15960


Change subject: IMPALA-9755: Flaky test: test_global_exchange_counters
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IMPALA-9755: Flaky test: test_global_exchange_counters

De-flake TestObservability.test_global_exchange_counters in
test_observability.py.

IMPALA-6984 added a feature to send a Cancel RPC to running fragments
when the coordinator fragment fetches all rows defined by a limit. This
causes fragments to terminate early (which is a good thing). However,
test_global_exchange_counters expects each fragment to produce some
rows, which is why it recently became flaky.

This patch modifies test_global_exchange_counters so that it allows for
some fragments to produce 0 rows.

Testing:
* Ran test_observability.py locally
* Looped 8 concurrent streams of test_global_exchange_counters for an
  hour, no failures (previously I was able to reproduce the test issue
  within 5 minutes)

Change-Id: Icb3a1b5ccb5695eb71343e96cc830f12d5c72f1e
---
M tests/query_test/test_observability.py
1 file changed, 7 insertions(+), 4 deletions(-)



  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/60/15960/1
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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: newchange
Gerrit-Change-Id: Icb3a1b5ccb5695eb71343e96cc830f12d5c72f1e
Gerrit-Change-Number: 15960
Gerrit-PatchSet: 1
Gerrit-Owner: Sahil Takiar <[email protected]>

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