Alexey Serbin has uploaded a new change for review.

  http://gerrit.cloudera.org:8080/6901

Change subject: KUDU-1294 fix issue with unreleased consumption
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KUDU-1294 fix issue with unreleased consumption

In DEBUG builds, the DCHECK assert on unreleased consumption fires
time to time in the destructor of MemTracker objects.  The root was
found by Todd and described in the first comment on KUDU-1294.  This
patch fixes the issue by re-ordering the sequence of removing the
transaction driver from the map and releasing its memory consumption.

As a test, I ran 1K+ iterations of security-faults-itest test built
in DEBUG configuration with --stress-cpu-threads=8.  Prior to this fix,
usually ~15 out of 1024 run were failing due to the issue:
  http://dist-test.cloudera.org//job?job_id=aserbin.1494966417.6076
After the fix, there were not any failures in the whole 1K run:
  http://dist-test.cloudera.org//job?job_id=aserbin.1494963982.18117

Change-Id: I41d4fd4c0030af02ae5b1e83bd52833632ed6743
---
M src/kudu/tablet/transactions/transaction_tracker.cc
1 file changed, 7 insertions(+), 12 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/01/6901/1
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Gerrit-MessageType: newchange
Gerrit-Change-Id: I41d4fd4c0030af02ae5b1e83bd52833632ed6743
Gerrit-PatchSet: 1
Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-Owner: Alexey Serbin <[email protected]>

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