GitHub user scwf opened a pull request:
https://github.com/apache/spark/pull/1996
[SQL] use ConcurrentHashMap in SQLConf
http://stackoverflow.com/questions/510632/whats-the-difference-between-concurrenthashmap-and-collections-synchronizedmap
Collections.synchronizedMap(map) creates a blocking Map which will degrade
performance, albeit ensure consistency. So use ConcurrentHashMap(a more
effective thread-safe hashmap) instead.
also update HiveQuerySuite to fix test error when changed to
ConcurrentHashMap.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/scwf/spark sqlconf
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/1996.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #1996
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commit a7bcb98f93a2b55126e087e18ec75f8c1da40a71
Author: scwf <[email protected]>
Date: 2014-08-17T05:08:38Z
use ConcurrentHashMap in sql conf, intead synchronizedMap
commit 3c224d31abf2e4351f787506ebbdb9f0c9a8be7a
Author: scwf <[email protected]>
Date: 2014-08-17T05:16:31Z
fix formate
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