Impala Public Jenkins has submitted this change and it was merged. ( 
http://gerrit.cloudera.org:8080/16765 )

Change subject: IMPALA-10337: Consider MAX_ROW_SIZE when computing max 
reservation
......................................................................

IMPALA-10337: Consider MAX_ROW_SIZE when computing max reservation

PlanRootSink can fail silently if result spooling is enabled and
maxMemReservationBytes is less than 2 * MAX_ROW_SIZE. This happens
because results are spilled using a SpillableRowBatchQueue which needs 2
buffer (read and write) with at least MAX_ROW_SIZE bytes per buffer.
This patch fixes this by setting a lower bound of 2 * MAX_ROW_SIZE while
computing the min reservation for the PlanRootSink.

Testing:
- Pass exhaustive tests.
- Add e2e TestResultSpoolingMaxReservation.
- Lower MAX_ROW_SIZE on tests where MAX_RESULT_SPOOLING_MEM is set to
  extremely low value. Also verify that PLAN_ROOT_SINK's ReservationLimit
  remain unchanged after lowering the MAX_ROW_SIZE.

Change-Id: Id7138e1e034ea5d1cd15cf8de399690e52a9d726
Reviewed-on: http://gerrit.cloudera.org:8080/16765
Reviewed-by: Impala Public Jenkins <impala-public-jenk...@cloudera.com>
Tested-by: Impala Public Jenkins <impala-public-jenk...@cloudera.com>
---
M be/src/runtime/buffered-tuple-stream.h
M be/src/runtime/spillable-row-batch-queue.cc
M fe/src/main/java/org/apache/impala/planner/PlanRootSink.java
M tests/custom_cluster/test_query_retries.py
M tests/query_test/test_result_spooling.py
5 files changed, 118 insertions(+), 9 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: Id7138e1e034ea5d1cd15cf8de399690e52a9d726
Gerrit-Change-Number: 16765
Gerrit-PatchSet: 9
Gerrit-Owner: Riza Suminto <riza.sumi...@cloudera.com>
Gerrit-Reviewer: Bikramjeet Vig <bikramjeet....@cloudera.com>
Gerrit-Reviewer: Impala Public Jenkins <impala-public-jenk...@cloudera.com>
Gerrit-Reviewer: Quanlong Huang <huangquanl...@gmail.com>
Gerrit-Reviewer: Riza Suminto <riza.sumi...@cloudera.com>

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