Impala Public Jenkins has submitted this change and it was merged. ( 
http://gerrit.cloudera.org:8080/10503 )

Change subject: IMPALA-6812: Fix flaky Kudu scan tests
......................................................................

IMPALA-6812: Fix flaky Kudu scan tests

Many of our Kudu related tests have been flaky with the symptom that
scans appear to not return rows that were just inserted. This occurs
because our default Kudu scan level of READ_LATEST doesn't make any
consistency guarantees.

This patch adds a query option 'kudu_read_mode', which overrides the
startup flag of the same name, and then set that option to
READ_AT_SNAPSHOT for all tests with Kudu inserts and scans, which
should give us more consistent test results.

Testing:
- Passed a full exhaustive run. Does not appear to increase time to
  run by any significant amount.

Change-Id: I70df84f2cbc663107f2ad029565d3c15bdfbd47c
Reviewed-on: http://gerrit.cloudera.org:8080/10503
Reviewed-by: Impala Public Jenkins <[email protected]>
Tested-by: Impala Public Jenkins <[email protected]>
---
M be/src/exec/kudu-scanner.cc
M be/src/exec/kudu-util.cc
M be/src/exec/kudu-util.h
M be/src/service/query-options.cc
M be/src/service/query-options.h
M be/src/util/debug-util.cc
M be/src/util/debug-util.h
M common/thrift/ImpalaInternalService.thrift
M common/thrift/ImpalaService.thrift
M tests/common/test_dimensions.py
M tests/custom_cluster/test_kudu.py
M tests/metadata/test_ddl.py
M tests/query_test/test_kudu.py
13 files changed, 119 insertions(+), 8 deletions(-)

Approvals:
  Impala Public Jenkins: Looks good to me, approved; Verified

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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: merged
Gerrit-Change-Id: I70df84f2cbc663107f2ad029565d3c15bdfbd47c
Gerrit-Change-Number: 10503
Gerrit-PatchSet: 6
Gerrit-Owner: Thomas Marshall <[email protected]>
Gerrit-Reviewer: Dan Hecht <[email protected]>
Gerrit-Reviewer: David Ribeiro Alves <[email protected]>
Gerrit-Reviewer: Impala Public Jenkins <[email protected]>
Gerrit-Reviewer: Thomas Marshall <[email protected]>
Gerrit-Reviewer: Tim Armstrong <[email protected]>
Gerrit-Reviewer: Todd Lipcon <[email protected]>

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