[kudu-CR] [master] KUDU-3061 support auto rebalance tablet leaders across TServers

["Yuqi Du (Code Review)" <ge...@cloudera.org>]

Hello Tidy Bot, Kudu Jenkins, 

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

    http://gerrit.cloudera.org:8080/18454

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

Change subject: [master] KUDU-3061 support auto rebalance tablet leaders across TServers
......................................................................

[master] KUDU-3061 support auto rebalance tablet leaders across TServers

The number of leader tablets per tablet server can become imbalanced
over time, putting additional pressure on a few nodes.

A CLI tool or an extension to the existing balancer should be added to
take care of this.

Currently the only option is running leader_step_down manually.

TODO:
1. adding unit test, use TimerThread KUDU-3364 to refact codes.
2. Add a leader rebalance CLI tool.

Change-Id: Ibfb60d8759a93b6a19238637c27df4f6b1cac918
---
M src/kudu/master/CMakeLists.txt
A src/kudu/master/auto_leader_rebalancer-test.cc
A src/kudu/master/auto_leader_rebalancer.cc
A src/kudu/master/auto_leader_rebalancer.h
M src/kudu/master/auto_rebalancer-test.cc
M src/kudu/master/auto_rebalancer.cc
M src/kudu/master/auto_rebalancer.h
M src/kudu/master/catalog_manager.cc
M src/kudu/master/catalog_manager.h
9 files changed, 944 insertions(+), 30 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/54/18454/2
-- 
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Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: Ibfb60d8759a93b6a19238637c27df4f6b1cac918
Gerrit-Change-Number: 18454
Gerrit-PatchSet: 2
Gerrit-Owner: Yuqi Du <sh...@gmail.com>
Gerrit-Reviewer: Kudu Jenkins (120)
Gerrit-Reviewer: Tidy Bot (241)