wangfei 0e3ab94d41 [SQL] add note of use synchronizedMap in SQLConf ... Refer to: 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. Author: wangfei <wangfei_hello@126.com> Author: scwf <wangfei1@huawei.com> Closes #1996 from scwf/sqlconf and squashes the following commits: 93bc0c5 [wangfei] revert change of HiveQuerySuite 0cc05dd [wangfei] add note for use synchronizedMap 3c224d31 [scwf] fix formate a7bcb98 [scwf] use ConcurrentHashMap in sql conf, intead synchronizedMap		2014-08-19 19:37:02 -07:00
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src	[SQL] add note of use synchronizedMap in SQLConf	2014-08-19 19:37:02 -07:00
pom.xml	SPARK-2749 [BUILD]. Spark SQL Java tests aren't compiling in Jenkins' Maven builds; missing junit:junit dep	2014-07-30 15:04:33 -07:00