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| author | wangfei <wangfei_hello@126.com> | 2014-08-19 19:37:02 -0700 |
|---|---|---|
| committer | Reynold Xin <rxin@apache.org> | 2014-08-19 19:37:02 -0700 |
| commit | 0e3ab94d413fd70fff748fded42ab5e2ebd66fcc (patch) | |
| tree | f701a967ccaf450f40a1d908566d62034480dacc /docs/mllib-naive-bayes.md | |
| parent | c7252b0097cfacd36f17357d195b12a59e503b35 (diff) | |
| download | spark-0e3ab94d413fd70fff748fded42ab5e2ebd66fcc.tar.gz spark-0e3ab94d413fd70fff748fded42ab5e2ebd66fcc.tar.bz2 spark-0e3ab94d413fd70fff748fded42ab5e2ebd66fcc.zip | |
[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
Diffstat (limited to 'docs/mllib-naive-bayes.md')
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