[kudu-CR] [maintenance] use workload statistics to scale perf improvement

["Yifan Zhang (Code Review)" <ge...@cloudera.org>]

Hello Kudu Jenkins, Andrew Wong, 

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

    http://gerrit.cloudera.org:8080/15995

to look at the new patch set (#2).

Change subject: [maintenance] use workload statistics to scale perf_improvement
......................................................................

[maintenance] use workload statistics to scale perf_improvement

When we consider the performance improvement brought by maintenance
operations, we should consider tablet statistics, so we prefer 'hot'
tablets. This patch use a heuristic way to scale perf_improvement,
read/write rate that has been since the last maintenance op performs
will be add to the perf_improvement, so ops on 'hot' tablets will be
more likely to picked by maintenance manager.

Change-Id: Ie3afcc359002d1392164ba2fda885f8930ef8696
---
M src/kudu/tablet/tablet.cc
M src/kudu/tablet/tablet_mm_ops.cc
M src/kudu/tablet/tablet_mm_ops.h
M src/kudu/tablet/tablet_replica-test.cc
M src/kudu/tablet/tablet_replica_mm_ops.cc
M src/kudu/tablet/tablet_replica_mm_ops.h
M src/kudu/util/maintenance_manager.cc
7 files changed, 176 insertions(+), 31 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/95/15995/2
-- 
To view, visit http://gerrit.cloudera.org:8080/15995
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Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: Ie3afcc359002d1392164ba2fda885f8930ef8696
Gerrit-Change-Number: 15995
Gerrit-PatchSet: 2
Gerrit-Owner: Yifan Zhang <ch...@163.com>
Gerrit-Reviewer: Andrew Wong <aw...@cloudera.com>
Gerrit-Reviewer: Kudu Jenkins (120)