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From "Bharath Vissapragada (Code Review)" <ger...@cloudera.org>
Subject [Impala-ASF-CR] IMPALA-1972/IMPALA-3882: Fix client request state map lock contention
Date Thu, 18 May 2017 22:08:35 GMT
Bharath Vissapragada has uploaded a new patch set (#7).

Change subject: IMPALA-1972/IMPALA-3882: Fix client_request_state_map_lock_ contention
......................................................................

IMPALA-1972/IMPALA-3882: Fix client_request_state_map_lock_ contention

Holding client_request_state_map_lock_ and CRS::lock_ together in certain
paths could potentially block the impalad from registering new queries.
The most common occurrence of this is while loading the webpage of a
query while the query planning is still in progress. Since we hold the
CRS::lock_ during planning, it blocks the web page from loading which
inturn blocks incoming queries by holding client_request_state_map_lock_.

This patch makes client_request_state_map_lock_ a terminal lock so that
we don't have interleaving locking with CRS::lock_.

Testing: Tested it locally by adding a long sleep in
JniFrontend.createExecRequest() and still was able to refresh the web UI
and run parallel queries. Also added a custom cluster test that does the
same sequence of actions by injecting a metadata loading pause.

Change-Id: Ie44daa93e3ae4d04d091261f3ec4891caffe8026
---
M be/src/service/impala-beeswax-server.cc
M be/src/service/impala-hs2-server.cc
M be/src/service/impala-http-handler.cc
M be/src/service/impala-server.cc
M be/src/service/impala-server.h
A tests/custom_cluster/test_query_concurrency.py
M www/query_plan.tmpl
7 files changed, 151 insertions(+), 47 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/07/6707/7
-- 
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: Ie44daa93e3ae4d04d091261f3ec4891caffe8026
Gerrit-PatchSet: 7
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Bharath Vissapragada <bharathv@cloudera.com>
Gerrit-Reviewer: Bharath Vissapragada <bharathv@cloudera.com>
Gerrit-Reviewer: Dan Hecht <dhecht@cloudera.com>
Gerrit-Reviewer: Henry Robinson <henry@cloudera.com>

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