[kudu-CR] WIP: KUDU-1410 (part 5): rpc: sample each RPC method in several latency buckets, expose on /rpcz

["Todd Lipcon (Code Review)" <ge...@cloudera.org>]

Hello Jean-Daniel Cryans, Mike Percy, Adar Dembo,

I'd like you to do a code review.  Please visit

    http://gerrit.cloudera.org:8080/2798

to review the following change.

Change subject: WIP: KUDU-1410 (part 5): rpc: sample each RPC method in several latency buckets, expose on /rpcz
......................................................................

WIP: KUDU-1410 (part 5): rpc: sample each RPC method in several latency buckets, expose on /rpcz

This changes RpczStore to keep several sample traces for each RPC, categorized
into several buckets (fast, slow, slower). Currently the thresholds for those
buckets are hard-coded, but follow-up work could make them adaptive based on
previous RPC percentiles, or user-configurable. Having tested this with a
YCSB workload, I found that they are useful even in this simple implementation.

WIP because this needs some new tests, though I've been testing this on a
YCSB workload and it is relatively useful.

Change-Id: I0eadb3f7035b5b156cb624ce50876876a5698b17
---
M src/kudu/rpc/inbound_call.h
M src/kudu/rpc/rpc_introspection.proto
M src/kudu/rpc/rpcz_store.cc
M src/kudu/rpc/rpcz_store.h
M src/kudu/server/rpcz-path-handler.cc
5 files changed, 206 insertions(+), 15 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/98/2798/1
-- 
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Gerrit-MessageType: newchange
Gerrit-Change-Id: I0eadb3f7035b5b156cb624ce50876876a5698b17
Gerrit-PatchSet: 1
Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-Owner: Todd Lipcon <to...@apache.org>
Gerrit-Reviewer: Adar Dembo <ad...@cloudera.com>
Gerrit-Reviewer: Jean-Daniel Cryans
Gerrit-Reviewer: Mike Percy <mp...@apache.org>