[Impala-ASF-CR] IMPALA-4671: (part-1) Copy kudu::ServicePool into Impala namespace

["Sailesh Mukil (Code Review)" <ge...@cloudera.org>]

Sailesh Mukil has uploaded a new patch set (#3). ( http://gerrit.cloudera.org:8080/8471 )

Change subject: IMPALA-4671: (part-1) Copy kudu::ServicePool into Impala namespace
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IMPALA-4671: (part-1) Copy kudu::ServicePool into Impala namespace

*** THIS PATCH IS NOT FOR REVIEW. IT IS JUST UPLOADED TO MAKE THE
REVIEW OF PART-2 EASIER IN GERRIT BY SHOWING ONLY THE DIFFS OF THAT
PATCH AGAINST THIS PATCH. MORE EXPLANATION BELOW***

The KuduRPC subsystem uses kudu::ServicePool to service all incoming
RPCs. Since this lives inside the Kudu codebase, all instrumentation
of RPCs flowing through the KuduRPC subsystem is not visible to Impala,
as Kudu does not export this instrumentation, but only maintains it
internally within kudu::ServicePool.

In order to reliably view the instrumentation of all RPCs flowing through
KRPC, one option is to modify kudu::ServicePool to take their
instrumentation and display it on our webpages, which is very invasive.

A second option is to have a parallel implementation of kudu::ServicePool
which for all purposes behaves the same way, but instead has this extra
code that displays this instrumentation in our webpages.

This patch is Part 1 of the second option. In this patch, we simply copy
the kudu::ServicePool code into be/src/rpc/.

In the next patch (Part 2), we rename it to ImpalaServicePool,
and we do the instrumentation such that it shows up on the
webpage.

We split it up this way into 2 parts so that it will be easy to review.

Change-Id: I5bb927d4726d4fe418251b9734a4e232810fef69
---
A be/src/rpc/impala-service-pool.cc
A be/src/rpc/impala-service-pool.h
2 files changed, 317 insertions(+), 0 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/71/8471/3
-- 
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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I5bb927d4726d4fe418251b9734a4e232810fef69
Gerrit-Change-Number: 8471
Gerrit-PatchSet: 3
Gerrit-Owner: Sailesh Mukil <sa...@cloudera.com>