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From "Xuefu Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-12615) Do not start spark session when only explain
Date Tue, 08 Dec 2015 15:48:10 GMT

    [ https://issues.apache.org/jira/browse/HIVE-12615?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15046985#comment-15046985
] 

Xuefu Zhang commented on HIVE-12615:
------------------------------------

I think this is designed behavior as explain query shows the parallelism in the plan. The
cluster needs to be up in order to calc the parallelism.

> Do not start spark session when only explain 
> ---------------------------------------------
>
>                 Key: HIVE-12615
>                 URL: https://issues.apache.org/jira/browse/HIVE-12615
>             Project: Hive
>          Issue Type: Improvement
>          Components: Spark
>    Affects Versions: 1.3.0, 2.1.0
>            Reporter: Nemon Lou
>
> When using beeline -e "set hive.execution.engine=spark;explain select count(*) from sometable",it's
very slow due to starting of spark session on yarn.



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