[kudu-CR] KUDU-2612 keep-alive tracking for transactions

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

Hello Tidy Bot, Kudu Jenkins, Andrew Wong, Hao Hao, 

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

    http://gerrit.cloudera.org:8080/16729

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

Change subject: KUDU-2612 keep-alive tracking for transactions
......................................................................

KUDU-2612 keep-alive tracking for transactions

This patch introduces the functionality of tracking the liviness of
a distributed multi-row transaction into TxnStatusManager and
provides corresponding proxy methods in TxnManager, so a Kudu client
now can send keep-alive requests for a transaction (the implementation
of the latter is planned in a follow-up patch).

From the TxnStatusManager, the newly introduced keep-alive RPC is
represented as another type of CoordinateTransaction() request:
CoordinatorOpPB::KEEP_TXN_ALIVE.  New tests to cover the existing
functionality are added as well.

I'm planning to add more end-to-end tests once making Kudu
C++ client sending keepalive requests for started transactions.

Change-Id: Iae926e02fa7ca597b63ccea90124964c3b6a1175
---
M src/kudu/integration-tests/CMakeLists.txt
M src/kudu/integration-tests/ts_tablet_manager-itest.cc
A src/kudu/integration-tests/txn_status_manager-itest.cc
M src/kudu/integration-tests/txn_status_table-itest.cc
M src/kudu/master/txn_manager-test.cc
M src/kudu/master/txn_manager.cc
M src/kudu/tablet/txn_coordinator.h
M src/kudu/transactions/txn_status_entry.cc
M src/kudu/transactions/txn_status_entry.h
M src/kudu/transactions/txn_status_manager-test.cc
M src/kudu/transactions/txn_status_manager.cc
M src/kudu/transactions/txn_status_manager.h
M src/kudu/transactions/txn_status_tablet.h
M src/kudu/transactions/txn_system_client.cc
M src/kudu/transactions/txn_system_client.h
M src/kudu/tserver/tablet_service.cc
M src/kudu/tserver/ts_tablet_manager.cc
M src/kudu/tserver/ts_tablet_manager.h
18 files changed, 944 insertions(+), 44 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/29/16729/8
-- 
To view, visit http://gerrit.cloudera.org:8080/16729
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Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: Iae926e02fa7ca597b63ccea90124964c3b6a1175
Gerrit-Change-Number: 16729
Gerrit-PatchSet: 8
Gerrit-Owner: Alexey Serbin <as...@cloudera.com>
Gerrit-Reviewer: Alexey Serbin <as...@cloudera.com>
Gerrit-Reviewer: Andrew Wong <aw...@cloudera.com>
Gerrit-Reviewer: Hao Hao <ha...@cloudera.com>
Gerrit-Reviewer: Kudu Jenkins (120)
Gerrit-Reviewer: Tidy Bot (241)