[kudu-CR] KUDU-2289: Tablet deletion should be throttled

["Will Berkeley (Code Review)" <ge...@cloudera.org>]

Hello Tidy Bot, Alexey Serbin, Kudu Jenkins, Adar Dembo, Todd Lipcon, 

I'd like you to reexamine a change. Please visit

    http://gerrit.cloudera.org:8080/9551

to look at the new patch set (#7).

Change subject: KUDU-2289: Tablet deletion should be throttled
......................................................................

KUDU-2289: Tablet deletion should be throttled

When a table is deleted, the master eagerly sends DeleteTablet
requests for every replica of every tablet. Since DeleteTablet
can be IO-heavy and DeleteTablet is run by service threads,
deleting tables could harm other concurrent workloads.

This changes DeleteTablet to run on a threadpool. The number
of threads is capped by --num_tablets_to_delete_simultaneously,
which default to the number of data dirs, a proxy for the
number of disks. This should help throttle tablet deletions,
both preventing them from monopolizing service threads and
limiting their IO.

Change-Id: I3819bf8a3acf8ea03a76cc6cacd92d85bb114998
---
M src/kudu/integration-tests/delete_table-itest.cc
M src/kudu/tserver/tablet_service.cc
M src/kudu/tserver/ts_tablet_manager.cc
M src/kudu/tserver/ts_tablet_manager.h
M src/kudu/util/threadpool.h
5 files changed, 148 insertions(+), 44 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/51/9551/7
-- 
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Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I3819bf8a3acf8ea03a76cc6cacd92d85bb114998
Gerrit-Change-Number: 9551
Gerrit-PatchSet: 7
Gerrit-Owner: Will Berkeley <wd...@gmail.com>
Gerrit-Reviewer: Adar Dembo <ad...@cloudera.com>
Gerrit-Reviewer: Alexey Serbin <as...@cloudera.com>
Gerrit-Reviewer: Kudu Jenkins
Gerrit-Reviewer: Tidy Bot
Gerrit-Reviewer: Todd Lipcon <to...@apache.org>
Gerrit-Reviewer: Will Berkeley <wd...@gmail.com>