[kudu-CR] WIP KUDU-2780: create thread for auto-rebalancing (1/n)

["Hannah Nguyen (Code Review)" <ge...@cloudera.org>]

Hello Alexey Serbin, Kudu Jenkins, 

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

    http://gerrit.cloudera.org:8080/13891

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

Change subject: WIP KUDU-2780: create thread for auto-rebalancing (1/n)
......................................................................

WIP KUDU-2780: create thread for auto-rebalancing (1/n)

AutoRebalancerTask is a thread in the master with a configurable
polling interval. Every interval, the thread logs the current
skew of the cluster if auto-rebalancing is enabled.

Code that is modified/copied directly from the CLI rebalancing
tool in kudu/tools is marked.

The task currently calls the 'ksck' tool to determine skew, but
this will change in later patches when rebalancing is implemented
and the task retrieves information directly from the master.

Change-Id: Ibc829d14dc8636287bf3a4faa4ba76e86ab6885c
---
M src/kudu/benchmarks/tpch/tpch1.cc
M src/kudu/master/CMakeLists.txt
A src/kudu/master/autorebalancer-test.cc
A src/kudu/master/autorebalancer.cc
A src/kudu/master/autorebalancer.h
M src/kudu/master/catalog_manager.cc
M src/kudu/master/catalog_manager.h
7 files changed, 1,753 insertions(+), 6 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/91/13891/2
-- 
To view, visit http://gerrit.cloudera.org:8080/13891
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Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: Ibc829d14dc8636287bf3a4faa4ba76e86ab6885c
Gerrit-Change-Number: 13891
Gerrit-PatchSet: 2
Gerrit-Owner: Hannah Nguyen <ha...@cloudera.com>
Gerrit-Reviewer: Alexey Serbin <as...@cloudera.com>
Gerrit-Reviewer: Hannah Nguyen <ha...@cloudera.com>
Gerrit-Reviewer: Kudu Jenkins (120)