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From "Chaoyu Tang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-13149) Remove some unnecessary HMS connections from HS2
Date Fri, 26 Feb 2016 21:50:18 GMT

    [ https://issues.apache.org/jira/browse/HIVE-13149?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15169902#comment-15169902
] 

Chaoyu Tang commented on HIVE-13149:
------------------------------------

It might not be proper to share the HMS connection opened in HS2 main process, but I think
the session one could be shared which can avoid opening connection in the spawned task thread,
is not it? In addition, when these threads finish the tasks and die, should not they be collected?


> 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
>         Attachments: HIVE-13149.1.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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