[kudu-CR] KUDU-1704: add READ YOUR WRITES scan mode

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

Hello Alexey Serbin, Mike Percy, David Ribeiro Alves, Kudu Jenkins, Andrew Wong, 

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

    http://gerrit.cloudera.org:8080/8804

to look at the new patch set (#8).

Change subject: KUDU-1704: add READ_YOUR_WRITES scan mode
......................................................................

KUDU-1704: add READ_YOUR_WRITES scan mode

This patch adds a new read mode READ_YOUR_WRITES on tserver. In this mode,
the server will pick a snapshot in the past, subject to the propagated
timestamp bound, and perform a read. Moreover, the chosen snapshot
timestamp is returned back to the client.

The major difference between READ_AT_SNAPSHOT scan without a timestamp
and READ_YOUR_WRITES scan is the latter will choose the newest timestamp
within the staleness bound that allows execution of the reads without
being blocked by the in-flight transactions. READ_OWN_WRITES mode is not
repeatable. However, it allows client local read-your-writes.

Design doc: https://docs.google.com/document/d/1WRLzKdCmRxXjUpi-DZsz7l2gl6215BsNdORtDXrmgl0/edit?usp=sharing

Change-Id: I84ddb981a1a0f199d4e66f5d5097318f8c785a48
---
M src/kudu/common/common.proto
M src/kudu/tserver/tablet_server-test.cc
M src/kudu/tserver/tablet_service.cc
M src/kudu/tserver/tablet_service.h
4 files changed, 260 insertions(+), 52 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/04/8804/8
-- 
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Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I84ddb981a1a0f199d4e66f5d5097318f8c785a48
Gerrit-Change-Number: 8804
Gerrit-PatchSet: 8
Gerrit-Owner: Hao Hao <ha...@cloudera.com>
Gerrit-Reviewer: Alexey Serbin <as...@cloudera.com>
Gerrit-Reviewer: Andrew Wong <aw...@cloudera.com>
Gerrit-Reviewer: David Ribeiro Alves <da...@gmail.com>
Gerrit-Reviewer: Hao Hao <ha...@cloudera.com>
Gerrit-Reviewer: Kudu Jenkins
Gerrit-Reviewer: Mike Percy <mp...@apache.org>