[jira] [Comment Edited] (HIVE-13149) Remove some unnecessary HMS connections from HS2

["Thejas M Nair (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-13149?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15238342#comment-15238342 ] 

Thejas M Nair edited comment on HIVE-13149 at 4/13/16 12:50 AM:
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This is causing the timeouts seen in last few says with TestJdbcWithMiniHS2. This seems to be one of the reasons for last few tests runs taking longer.
I verified that reverting the patch gets the test working. The test results also complain about not being able to run TestJdbcWithMiniHS2.




was (Author: thejas):
This is causing the timeouts seen in last few says with TestJdbcWithMiniHS2. This seems to be one of the reasons for tests runs taking longer now.
I verified that reverting the patch gets the test working. The test results also complain about not being able to run TestJdbcWithMiniHS2.



> Remove some unnecessary HMS connections from HS2 
> -------------------------------------------------
>
>                 Key: HIVE-13149
>                 URL: https://issues.apache.org/jira/browse/HIVE-13149
>             Project: Hive
>          Issue Type: Sub-task
>          Components: HiveServer2
>    Affects Versions: 2.0.0
>            Reporter: Aihua Xu
>            Assignee: Aihua Xu
>             Fix For: 2.1.0
>
>         Attachments: HIVE-13149.1.patch, HIVE-13149.2.patch, HIVE-13149.3.patch, HIVE-13149.4.patch, HIVE-13149.5.patch, HIVE-13149.6.patch, HIVE-13149.7.patch
>
>
> In SessionState class, currently we will always try to get a HMS connection in {{start(SessionState startSs, boolean isAsync, LogHelper console)}} regardless of if the connection will be used later or not. 
> When SessionState is accessed by the tasks in TaskRunner.java, although most of the tasks other than some like StatsTask, don't need to access HMS. Currently a new HMS connection will be established for each Task thread. If HiveServer2 is configured to run in parallel and the query involves many tasks, then the connections are created but unused.
> {noformat}
>   @Override
>   public void run() {
>     runner = Thread.currentThread();
>     try {
>       OperationLog.setCurrentOperationLog(operationLog);
>       SessionState.start(ss);
>       runSequential();
> {noformat}



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