[kudu-CR] Make ConsensusMetadata thread-safe

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

Hello David Ribeiro Alves, Alexey Serbin,

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

    http://gerrit.cloudera.org:8080/6958

to look at the new patch set (#2).

Change subject: Make ConsensusMetadata thread-safe
......................................................................

Make ConsensusMetadata thread-safe

This patch simply adds locks around all accessors and makes
ConsensusMetadata refcounted. This enables ConsensusMetadata to be
safely used outside of the RaftConsensus class (with certain caveats).

This is needed to implement tombstoned voting in a follow-up patch.

Change-Id: Id2c70605c0593e55486184705ea448dcb4bef2d7
---
M src/kudu/consensus/consensus_meta-test.cc
M src/kudu/consensus/consensus_meta.cc
M src/kudu/consensus/consensus_meta.h
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/integration-tests/ts_recovery-itest.cc
M src/kudu/master/sys_catalog.cc
M src/kudu/tablet/tablet_bootstrap-test.cc
M src/kudu/tablet/tablet_bootstrap.cc
M src/kudu/tablet/tablet_replica-test.cc
M src/kudu/tablet/tablet_replica.cc
M src/kudu/tools/tool_action_local_replica.cc
M src/kudu/tserver/tablet_copy_client.cc
M src/kudu/tserver/tablet_copy_client.h
M src/kudu/tserver/tablet_copy_source_session-test.cc
M src/kudu/tserver/ts_tablet_manager.cc
17 files changed, 198 insertions(+), 101 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/58/6958/2
-- 
To view, visit http://gerrit.cloudera.org:8080/6958
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: Id2c70605c0593e55486184705ea448dcb4bef2d7
Gerrit-PatchSet: 2
Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-Owner: Mike Percy <mp...@apache.org>
Gerrit-Reviewer: Alexey Serbin <as...@cloudera.com>
Gerrit-Reviewer: David Ribeiro Alves <da...@gmail.com>
Gerrit-Reviewer: Mike Percy <mp...@apache.org>
Gerrit-Reviewer: Tidy Bot
Gerrit-Reviewer: Todd Lipcon <to...@apache.org>