Michael Ho has uploaded a new patch set (#4).

Change subject: IMPALA-4670: Introduces RpcMgr class
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IMPALA-4670: Introduces RpcMgr class

This patch introduces a new class, RpcMgr which is the abstraction
layer around KRPC core mechanics. It provides an interface
RegisterService() for various services to register themselves.

Kudu RPC is invoked via an auto-generated interface called proxy.
This change implements an inline wrapper for KRPC client to obtain
a proxy for a particular service exported by remote server.

Last but not least, the RpcMgr will start all registered services
if FLAGS_use_krpc is true. This patch hasn't yet added any service
except for some test services in rpc-mgr-test.

This patch is based on an abandoned patch by Henry Robinson.

Testing done: a new backend test is added to exercise the code
and demonstrate the way to interact with KRPC framework.

Change-Id: I8adb10ae375d7bf945394c38a520f12d29cf7b46
---
M CMakeLists.txt
M be/src/exec/kudu-util.h
M be/src/rpc/CMakeLists.txt
A be/src/rpc/rpc-mgr-test.cc
A be/src/rpc/rpc-mgr.cc
A be/src/rpc/rpc-mgr.h
A be/src/rpc/rpc-mgr.inline.h
M be/src/runtime/exec-env.cc
M be/src/runtime/exec-env.h
M be/src/scheduling/scheduler-test-util.cc
M be/src/scheduling/scheduler.cc
M be/src/scheduling/scheduler.h
M be/src/util/counting-barrier.h
M be/src/util/network-util.cc
M be/src/util/network-util.h
A common/protobuf/CMakeLists.txt
A common/protobuf/rpc_test.proto
17 files changed, 761 insertions(+), 39 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/01/7901/4
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I8adb10ae375d7bf945394c38a520f12d29cf7b46
Gerrit-PatchSet: 4
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Michael Ho <[email protected]>
Gerrit-Reviewer: Michael Ho <[email protected]>
Gerrit-Reviewer: Sailesh Mukil <[email protected]>

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