Todd Lipcon has submitted this change and it was merged.

Change subject: KUDU-1477. Pending COMMIT message for failed write operation 
can prevent tablet startup
......................................................................


KUDU-1477. Pending COMMIT message for failed write operation can prevent tablet 
startup

This fixes a bug seen in a recent YCSB stress test that I ran
in which I was accidentally writing tens of thousands of duplicate
keys per second. After a tablet server restarted, it failed to come
up due to a pending commit which referred to no mutated stores
(e.g. because all of the operations were duplicate key inserts).

This patch tweaks the logic for this safety check: a commit with no
mutated stores trivially has "no active stores". However, that's not
the same as having "only inactive stores" -- the subtlety is in the
difference in behavior when a commit has no stores at all.

The patch adds a new targeted test in tablet_bootstrap-test as well as
a more end-to-end test in ts_recovery-itest. Both reproduced the bug
reliably before this patch.

Change-Id: I8ecf8d780de1aa89fae4e0510d8291eb1f1cee11
Reviewed-on: http://gerrit.cloudera.org:8080/3321
Tested-by: Kudu Jenkins
Reviewed-by: David Ribeiro Alves <dral...@apache.org>
(cherry picked from commit 6894438a406a635dc8a8f3bd77862294163cc7fb)
Reviewed-on: http://gerrit.cloudera.org:8080/3464
Reviewed-by: Todd Lipcon <t...@apache.org>
---
M src/kudu/consensus/log-test-base.h
M src/kudu/integration-tests/raft_consensus-itest.cc
M src/kudu/integration-tests/test_workload.cc
M src/kudu/integration-tests/test_workload.h
M src/kudu/integration-tests/ts_recovery-itest.cc
M src/kudu/tablet/tablet_bootstrap-test.cc
M src/kudu/tablet/tablet_bootstrap.cc
7 files changed, 148 insertions(+), 23 deletions(-)

Approvals:
  Todd Lipcon: Looks good to me, approved
  Kudu Jenkins: Verified



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Gerrit-MessageType: merged
Gerrit-Change-Id: I8ecf8d780de1aa89fae4e0510d8291eb1f1cee11
Gerrit-PatchSet: 3
Gerrit-Project: kudu
Gerrit-Branch: branch-0.9.x
Gerrit-Owner: Todd Lipcon <t...@apache.org>
Gerrit-Reviewer: David Ribeiro Alves <dral...@apache.org>
Gerrit-Reviewer: Kudu Jenkins
Gerrit-Reviewer: Todd Lipcon <t...@apache.org>

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