[kudu-CR] KUDU-798 (part 1) Unify leader/follower mvcc behavior

["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:8080/5055

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

Change subject: KUDU-798 (part 1) Unify leader/follower mvcc behavior
......................................................................

KUDU-798 (part 1) Unify leader/follower mvcc behavior

This patch does the following:
1) It moves timestamp assignment from tablet and into the
TransactionDriver to be done prior to pushing the operation to
consensus for replication. Follow up patches will move it to be done
within consensus itself (though not necessarily managed by any of the
consensus classes).
2) It makes all operations be "operations at a timestamp", making
all operations have the same behavior within mvcc independently of
whether they were started at the leader or at a follower.

Follow up patches will completely remove the Mvcc APIs for automatic
safe time advancement and timestamp assignment and will introduce
the new entity responsible for "safe time".

Change-Id: I3ba7212f9211f585d4bef00e5ccfc24d5eece224
---
M src/kudu/tablet/local_tablet_writer.h
M src/kudu/tablet/tablet.cc
M src/kudu/tablet/tablet.h
M src/kudu/tablet/tablet_peer.cc
M src/kudu/tablet/transactions/transaction_driver.cc
M src/kudu/tablet/transactions/transaction_driver.h
M src/kudu/tablet/transactions/transaction_tracker-test.cc
7 files changed, 56 insertions(+), 27 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/55/5055/8
-- 
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I3ba7212f9211f585d4bef00e5ccfc24d5eece224
Gerrit-PatchSet: 8
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: Jean-Daniel Cryans <jd...@apache.org>
Gerrit-Reviewer: Kudu Jenkins
Gerrit-Reviewer: Mike Percy <mp...@apache.org>
Gerrit-Reviewer: Tidy Bot
Gerrit-Reviewer: Todd Lipcon <to...@apache.org>