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Date: Tue, 13 Jan 2015 01:03:35 +0000 (UTC)
From: "Xuefu Zhang (JIRA)" <jira@apache.org>
To: hive-dev@hadoop.apache.org
Message-ID: <JIRA.12765038.1420512139000.66223.1421111015033@Atlassian.JIRA>
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 <JIRA.12765038.1420512139012@arcas>
Subject: [jira] [Updated] (HIVE-9258) Explain query should share the same
 Spark application with regular queries [Spark Branch]
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     [ https://issues.apache.org/jira/browse/HIVE-9258?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Xuefu Zhang updated HIVE-9258:
------------------------------
    Summary: Explain query should share the same Spark application with regular queries [Spark Branch]  (was: Explain query shouldn't launch a Spark application [Spark Branch])

> Explain query should share the same Spark application with regular queries [Spark Branch]
> -----------------------------------------------------------------------------------------
>
>                 Key: HIVE-9258
>                 URL: https://issues.apache.org/jira/browse/HIVE-9258
>             Project: Hive
>          Issue Type: Sub-task
>          Components: Spark
>            Reporter: Xuefu Zhang
>            Assignee: Jimmy Xiang
>
> Currently for Hive on Spark, query plan includes the number of reducers, which is determined partly by the Spark cluster. Thus, explain query will need to launch a Spark application (Spark remote context), which is costly. To make things worse, the application is discarded right way.
> Ideally, we shouldn't launch a Spark application even for an explain query.


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