Juan Yu has uploaded a new patch set (#6).

Change subject: IMPALA-2076: Correct execution time tracking for 
DataStreamSender.
......................................................................

IMPALA-2076: Correct execution time tracking for DataStreamSender.

DataStreamSender uses multiple channels (each channel uses one thread)
to send data. We want to know the active wall-clock time used by
DataStreamSender no matter how many threads are used so ignore receiver
waiting time and only count concurrent sending time and batch
serialization time.
Added a ConcurrentStopWatch class to get concurrent transmit time.
If a thread is already running, the following thread won't reset the
stop watch. And the stop watch is stopped only after all threads finish
their work.

Change-Id: I9c530b2056d852c8bcac6263e9e6b1a6bede1047
---
A be/src/runtime/backend-client.h
M be/src/runtime/client-cache.h
M be/src/runtime/coordinator.cc
M be/src/runtime/coordinator.h
M be/src/runtime/data-stream-sender.cc
M be/src/runtime/data-stream-sender.h
M be/src/runtime/data-stream-test.cc
M be/src/runtime/exec-env.cc
M be/src/runtime/exec-env.h
M be/src/runtime/runtime-filter.cc
M be/src/runtime/runtime-state.h
M be/src/service/fragment-exec-state.cc
M be/src/service/fragment-exec-state.h
M be/src/util/runtime-profile-test.cc
M be/src/util/runtime-profile.cc
M be/src/util/runtime-profile.h
M be/src/util/stopwatch.h
17 files changed, 370 insertions(+), 44 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala refs/changes/78/2578/6
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I9c530b2056d852c8bcac6263e9e6b1a6bede1047
Gerrit-PatchSet: 6
Gerrit-Project: Impala
Gerrit-Branch: cdh5-trunk
Gerrit-Owner: Juan Yu <j...@cloudera.com>
Gerrit-Reviewer: Henry Robinson <he...@cloudera.com>
Gerrit-Reviewer: Juan Yu <j...@cloudera.com>
Gerrit-Reviewer: Sailesh Mukil <sail...@cloudera.com>

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