[kudu-CR] KUDU-798 (part 4) Add a TimeManager to manage safe time advancement

["David Ribeiro Alves (Code Review)" <ge...@cloudera.org>]

Hello Kudu Jenkins,

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

    http://gerrit.cloudera.org:8080/5300

to look at the new patch set (#9).

Change subject: KUDU-798 (part 4) Add a TimeManager to manage safe time advancement
......................................................................

KUDU-798 (part 4) Add a TimeManager to manage safe time advancement

This patch adds an entity to manage safe time (the timestamp before
which all transactions are committed/aborted or in-flight) across
a consensus configuration. This allows scans to make sure/wait that
the scan timestamp is safe, thus making sure the scan is repeatable.

This adds a small unit test. Follow up patches will use this
in integration tests.

Change-Id: I0bb2b1d2590ed7ead6f1980f9572be10444bb81b
---
M src/kudu/consensus/CMakeLists.txt
A src/kudu/consensus/time_manager-test.cc
A src/kudu/consensus/time_manager.cc
A src/kudu/consensus/time_manager.h
4 files changed, 645 insertions(+), 0 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/00/5300/9
-- 
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I0bb2b1d2590ed7ead6f1980f9572be10444bb81b
Gerrit-PatchSet: 9
Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-Owner: David Ribeiro Alves <dr...@apache.org>
Gerrit-Reviewer: Alexey Serbin <as...@cloudera.com>
Gerrit-Reviewer: David Ribeiro Alves <dr...@apache.org>
Gerrit-Reviewer: Kudu Jenkins
Gerrit-Reviewer: Mike Percy <mp...@apache.org>
Gerrit-Reviewer: Tidy Bot
Gerrit-Reviewer: Todd Lipcon <to...@apache.org>