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I'd like you to reexamine a change.  Please visit


to look at the new patch set (#19).

Change subject: KUDU-236 (part 1). Implement tablet history GC

KUDU-236 (part 1). Implement tablet history GC

This patch defines the concept of an "ancient history mark" (AHM) and a
background job that removes history from disk that represents changes
occurring prior to the ancient history mark.

There is also a mechanism to reject requests for scans if they attempt
to open a snapshot scan at a timestamp prior to the AHM.

Included tests:

* Test for Redo GC via major delta compaction
* Test for history GC via tablet flush
* Test for Undo GC via merge compaction
* Test for entire-row GC via merge compaction
* Test for ghost rows in multiple RS reinsert case
* Test for reupdating missed deltas
* Test for partial rowset history GC using alternating rows
* Test for major delta compaction against a subset of columns
* Test for reinsert after delete that is prior to AHM
* Test for opening a scanner at TS < AHM and rejecting that scanner at
  the RPC level

Tests coming in a follow-up commit:

* Randomized test

Missing features coming in follow-up commits:

* Background task that schedules and performs undo GC
* GC history on delta flush

Change-Id: If9833a863f118eb82be80ea56204d0d9141611c2
M src/kudu/common/timestamp.h
M src/kudu/integration-tests/CMakeLists.txt
A src/kudu/integration-tests/tablet_history_gc-itest.cc
M src/kudu/server/clock.h
M src/kudu/server/hybrid_clock.cc
M src/kudu/server/hybrid_clock.h
M src/kudu/tablet/CMakeLists.txt
M src/kudu/tablet/compaction-test.cc
M src/kudu/tablet/compaction.cc
M src/kudu/tablet/compaction.h
M src/kudu/tablet/delta_compaction.cc
M src/kudu/tablet/delta_compaction.h
M src/kudu/tablet/diskrowset.cc
M src/kudu/tablet/diskrowset.h
M src/kudu/tablet/mutation.h
M src/kudu/tablet/rowset_metadata.h
M src/kudu/tablet/tablet-harness.h
M src/kudu/tablet/tablet-test-base.h
M src/kudu/tablet/tablet-test-util.h
M src/kudu/tablet/tablet-test.cc
M src/kudu/tablet/tablet.cc
M src/kudu/tablet/tablet.h
A src/kudu/tablet/tablet_history_gc-test.cc
M src/kudu/tserver/tablet_service.cc
24 files changed, 991 insertions(+), 155 deletions(-)

  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/76/3076/19
To view, visit http://gerrit.cloudera.org:8080/3076
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: If9833a863f118eb82be80ea56204d0d9141611c2
Gerrit-PatchSet: 19
Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-Owner: Mike Percy <mpe...@apache.org>
Gerrit-Reviewer: Adar Dembo <a...@cloudera.com>
Gerrit-Reviewer: Kudu Jenkins
Gerrit-Reviewer: Mike Percy <mpe...@apache.org>
Gerrit-Reviewer: Todd Lipcon <t...@apache.org>

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