Alexey Serbin has submitted this change and it was merged. ( 
http://gerrit.cloudera.org:8080/16332 )

Change subject: KUDU-1587 part 1: load meter for ThreadPool
......................................................................

KUDU-1587 part 1: load meter for ThreadPool

This patch introduces a load meter for ThreadPool, aiming to use
active queue management techniques (AQM) such as CoDel [1] in scenarios
where thread pool queue load metrics are applicable (e.g., KUDU-1587).

[1] https://en.wikipedia.org/wiki/CoDel

Change-Id: I640716dc32f193e68361ca623ee7b9271e661d8b
Reviewed-on: http://gerrit.cloudera.org:8080/16332
Tested-by: Kudu Jenkins
Reviewed-by: Andrew Wong <[email protected]>
---
M src/kudu/util/threadpool-test.cc
M src/kudu/util/threadpool.cc
M src/kudu/util/threadpool.h
3 files changed, 603 insertions(+), 28 deletions(-)

Approvals:
  Kudu Jenkins: Verified
  Andrew Wong: Looks good to me, approved

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Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-MessageType: merged
Gerrit-Change-Id: I640716dc32f193e68361ca623ee7b9271e661d8b
Gerrit-Change-Number: 16332
Gerrit-PatchSet: 17
Gerrit-Owner: Alexey Serbin <[email protected]>
Gerrit-Reviewer: Alexey Serbin <[email protected]>
Gerrit-Reviewer: Andrew Wong <[email protected]>
Gerrit-Reviewer: Kudu Jenkins (120)
Gerrit-Reviewer: Tidy Bot (241)
Gerrit-Reviewer: Todd Lipcon <[email protected]>

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