Henry Robinson has uploaded a new patch set (#3).

Change subject: IMPALA-4187: Switch RPC latency metrics to histograms
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IMPALA-4187: Switch RPC latency metrics to histograms

It's usually better to measure latency distributions with histograms,
not avg / min / max. This change switches out the metrics that measure
the latency of RPC processing time to histograms.

Add HistogramMetric::Reset() to allow histogram to remove all
entries. Added spinlock around histogram access.

On a 8-core i7 @ 3.4GHz, the following throughputs were observed:

1 thread -> 25M updates/sec
4 threads -> 7M updates/sec
16 threads -> 5M updates/sec

Change-Id: I9ba6d4270dd5676eeeff35ad8d9dc5dcddd95e34
---
M be/src/rpc/rpc-trace.cc
M be/src/rpc/rpc-trace.h
M be/src/util/histogram-metric.h
3 files changed, 61 insertions(+), 36 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/16/4516/3
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I9ba6d4270dd5676eeeff35ad8d9dc5dcddd95e34
Gerrit-PatchSet: 3
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Henry Robinson <he...@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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