Marton Greber has submitted this change and it was merged. ( 
http://gerrit.cloudera.org:8080/22708 )

Change subject: [compaction] Add memory tracking for better OOM issues triaging
......................................................................

[compaction] Add memory tracking for better OOM issues triaging

This patch adds memory accounting for RowSet compaction.
The memory usage is tracked under newly added MemTracker.
The tracker is added per rowset compaction operation. The same
tracker is shared across multiple compaction inputs that are
involved in that specific compaction operation. Each input
has its own usage added to shared memory tracker during the
initialisation and is deducted in corresponding destructor.
Along with that, throttled warning messages are added when the
memory usage goes beyond a certain threshold.

A unit test is added to verify the presence of warning messages
when memory threshold (reduced for test purpose) is crossed.

Change-Id: I700fdf5ee0fbf0f2826b863d23d599f03ad4ac49
Reviewed-on: http://gerrit.cloudera.org:8080/22708
Reviewed-by: Zoltan Martonka <[email protected]>
Tested-by: Marton Greber <[email protected]>
Reviewed-by: Marton Greber <[email protected]>
---
M src/kudu/tablet/compaction-highmem-test.cc
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/diskrowset.cc
M src/kudu/tablet/diskrowset.h
M src/kudu/tablet/memrowset.cc
M src/kudu/tablet/memrowset.h
M src/kudu/tablet/mock-rowsets.h
M src/kudu/tablet/rowset.cc
M src/kudu/tablet/rowset.h
M src/kudu/tablet/tablet.cc
13 files changed, 229 insertions(+), 40 deletions(-)

Approvals:
  Zoltan Martonka: Looks good to me, but someone else must approve
  Marton Greber: Looks good to me, approved; Verified

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Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-MessageType: merged
Gerrit-Change-Id: I700fdf5ee0fbf0f2826b863d23d599f03ad4ac49
Gerrit-Change-Number: 22708
Gerrit-PatchSet: 4
Gerrit-Owner: Ashwani Raina <[email protected]>
Gerrit-Reviewer: Ashwani Raina <[email protected]>
Gerrit-Reviewer: Kudu Jenkins (120)
Gerrit-Reviewer: Marton Greber <[email protected]>
Gerrit-Reviewer: Zoltan Martonka <[email protected]>

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