Alexey Serbin has submitted this change and it was merged. ( 
http://gerrit.cloudera.org:8080/22752 )

Change subject: [consensus] fix result status handling
......................................................................

[consensus] fix result status handling

This patch addresses sloppy result handling of functions/methods
that return Status under the src/kudu/consensus directory.

In addition, this patch introduces a new unsafe runtime flag
--raft_allow_committed_pending_index_gap that's now used by the
TsRecoveryITestDeathTest.RecoverFromOpIdOverflow test scenario only.
The test scenario was reliant on the sloppy result status handling
of the call to PendingRounds::SetInitialCommittedOpId() in
RaftConsensus::Start() that's been addressed in this patch.  It's
the path of least resistance compared with updating test scaffolding
and the test scenario itself, but it also has a benefit of providing
a flag to enable the former result status handling approach in
RaftConsensus::Start() when setting last committed OpId for a tablet's
Raft consensus implementation.  Frankly, I don't think anybody will ever
need to re-enable the original bogus behavior of ignoring non-OK result
status, but it doesn't hurt to have such an option just in case
if I'm missing something here.

Change-Id: I6db113c58c6b453bf3cd290ee0dfdd184b63b999
Reviewed-on: http://gerrit.cloudera.org:8080/22646
Reviewed-by: Abhishek Chennaka <[email protected]>
Tested-by: Alexey Serbin <[email protected]>
(cherry picked from commit bde9cbad115deb1cd689eb583a1c7a8d3440b156)
Reviewed-on: http://gerrit.cloudera.org:8080/22752
---
M src/kudu/consensus/consensus_peers-test.cc
M src/kudu/consensus/consensus_peers.cc
M src/kudu/consensus/consensus_queue-test.cc
M src/kudu/consensus/consensus_queue.cc
M src/kudu/consensus/consensus_queue.h
M src/kudu/consensus/log-test.cc
M src/kudu/consensus/log.cc
M src/kudu/consensus/log_anchor_registry.cc
M src/kudu/consensus/log_anchor_registry.h
M src/kudu/consensus/log_cache-test.cc
M src/kudu/consensus/peer_manager.cc
M src/kudu/consensus/pending_rounds.cc
M src/kudu/consensus/raft_consensus.cc
M src/kudu/consensus/raft_consensus_quorum-test.cc
M src/kudu/consensus/time_manager-test.cc
M src/kudu/integration-tests/ts_recovery-itest.cc
16 files changed, 94 insertions(+), 71 deletions(-)

Approvals:
  Abhishek Chennaka: Looks good to me, approved
  Alexey Serbin: Verified

--
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Gerrit-Project: kudu
Gerrit-Branch: branch-1.18.x
Gerrit-MessageType: merged
Gerrit-Change-Id: I6db113c58c6b453bf3cd290ee0dfdd184b63b999
Gerrit-Change-Number: 22752
Gerrit-PatchSet: 2
Gerrit-Owner: Alexey Serbin <[email protected]>
Gerrit-Reviewer: Abhishek Chennaka <[email protected]>
Gerrit-Reviewer: Alexey Serbin <[email protected]>
Gerrit-Reviewer: Kudu Jenkins (120)
Gerrit-Reviewer: Marton Greber <[email protected]>

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