[kudu-CR] [c++] Reuse snapshot scan timestamp across tablets

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

Hello Kudu Jenkins,

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

    http://gerrit.cloudera.org:8080/5143

to look at the new patch set (#7).

Change subject: [c++] Reuse snapshot scan timestamp across tablets
......................................................................

[c++] Reuse snapshot scan timestamp across tablets

KUDU-1189 On reads at a snapshot that touch multiple tablets, without
the user setting a timestamp, use the timestamp from the first server
for following scans.

For a READ_AT_SNAPSHOT scan operation with no snapshot timestamp
specified, store the snapshot timestamp returned from the first tablet
server into the scan configuration object. Then reuse it when
continuing the scan on other tablet servers operations performed at
other tablet servers.

Added corresponding unit test as well.

Change-Id: I2ac708e38b8a80834f7d54eca294517cbfb06ec6
---
M src/kudu/client/client-test.cc
M src/kudu/client/client.h
M src/kudu/client/scanner-internal.cc
M src/kudu/integration-tests/consistency-itest.cc
4 files changed, 79 insertions(+), 4 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/43/5143/7
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I2ac708e38b8a80834f7d54eca294517cbfb06ec6
Gerrit-PatchSet: 7
Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-Owner: Alexey Serbin <as...@cloudera.com>
Gerrit-Reviewer: Alexey Serbin <as...@cloudera.com>
Gerrit-Reviewer: David Ribeiro Alves <dr...@apache.org>
Gerrit-Reviewer: Jean-Daniel Cryans <jd...@apache.org>
Gerrit-Reviewer: Kudu Jenkins
Gerrit-Reviewer: Todd Lipcon <to...@apache.org>