Hello David Ribeiro Alves, Mike Percy,

I'd like you to do a code review.  Please visit

    http://gerrit.cloudera.org:8080/4476

to review the following change.

Change subject: WIP: consensus: refactor tracking of received OpIds out of 
ReplicaState
......................................................................

WIP: consensus: refactor tracking of received OpIds out of ReplicaState

The PeerMessageQueue class was already tracking the last appended OpId, so
tracking it in ReplicaState was redundant and confusing. This removes a
bunch of stuff from ReplicaState and adds just a little bit of new
functionality to PeerMessageQueue:

- TruncateOpsAfter() now takes an index instead of an OpId. The queue
  can already map the index to an OpId by asking the log.
- Added a getter to expose the last OpId in the log back to RaftConsensus
- Changed OpId generation to happen in PeerMessageQueue. This was easy
  because it already knows the previous OpId and the current term.

The 'last_received_cur_leader' tracking was moved into RaftConsensus
itself, since it's just transient state tracking the RPC back-and-forths
between a leader and the follower.

This patch also removes raft_consensus-test, the mock-based testing for
RaftConsensus. I found that maintaining this test was very difficult, in
particular because now we rely on the fact that AppendOperations() is
reflected in GetLastOpIdInLog(). With a mock PeerMessageQueue, this
state update wasn't happening properly, and trying to reproduce that
behavior in the mocks themselves seemed like I was basically
re-implementing the actual production code for the queue. I looked over
the tests in this suite and I believe all of the cases are covered by
various other tests (randomized and otherwise).

I looped raft_consensus-itest 100 times[1], the Churny test case 1000
times[2], and exactly_once_writes-itest 1000 times[3]. Lastly, I was
able to re-enable TestChurnyElections_WithNotificationLatency and loop
it 500 times[4].

[1] http://dist-test.cloudera.org/job?job_id=todd.1474357631.30024
[2] http://dist-test.cloudera.org//job?job_id=todd.1474359004.2328
[3] http://dist-test.cloudera.org//job?job_id=todd.1474358436.31536
[4] http://dist-test.cloudera.org//job?job_id=todd.1474359250.4834

Change-Id: I81614d26328b0fbba37bf279f59717e05a07b816
---
M src/kudu/consensus/CMakeLists.txt
M src/kudu/consensus/consensus_queue.cc
M src/kudu/consensus/consensus_queue.h
D src/kudu/consensus/raft_consensus-test.cc
M src/kudu/consensus/raft_consensus.cc
M src/kudu/consensus/raft_consensus.h
M src/kudu/consensus/raft_consensus_quorum-test.cc
M src/kudu/consensus/raft_consensus_state.cc
M src/kudu/consensus/raft_consensus_state.h
M src/kudu/integration-tests/raft_consensus-itest.cc
10 files changed, 52 insertions(+), 795 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/76/4476/1
-- 
To view, visit http://gerrit.cloudera.org:8080/4476
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Gerrit-MessageType: newchange
Gerrit-Change-Id: I81614d26328b0fbba37bf279f59717e05a07b816
Gerrit-PatchSet: 1
Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-Owner: Todd Lipcon <t...@apache.org>
Gerrit-Reviewer: David Ribeiro Alves <dral...@apache.org>
Gerrit-Reviewer: Mike Percy <mpe...@apache.org>

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