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