Quanlong Huang has submitted this change and it was merged. ( 
http://gerrit.cloudera.org:8080/12513 )

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]>
Reviewed-on: http://gerrit.cloudera.org:8080/12513
Reviewed-by: Thomas Marshall <[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, 120 insertions(+), 8 deletions(-)

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

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Gerrit-Project: Impala-ASF
Gerrit-Branch: 2.x
Gerrit-MessageType: merged
Gerrit-Change-Id: I70df84f2cbc663107f2ad029565d3c15bdfbd47c
Gerrit-Change-Number: 12513
Gerrit-PatchSet: 3
Gerrit-Owner: Quanlong Huang <[email protected]>
Gerrit-Reviewer: Impala Public Jenkins <[email protected]>
Gerrit-Reviewer: Quanlong Huang <[email protected]>
Gerrit-Reviewer: Thomas Marshall <[email protected]>

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