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From "Xuefu Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-16552) Limit the number of tasks a Spark job may contain
Date Thu, 04 May 2017 16:33:04 GMT

    [ https://issues.apache.org/jira/browse/HIVE-16552?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15997032#comment-15997032
] 

Xuefu Zhang commented on HIVE-16552:
------------------------------------

Committed to master. Thanks to Rui for the review.

> Limit the number of tasks a Spark job may contain
> -------------------------------------------------
>
>                 Key: HIVE-16552
>                 URL: https://issues.apache.org/jira/browse/HIVE-16552
>             Project: Hive
>          Issue Type: Improvement
>          Components: Spark
>    Affects Versions: 1.0.0, 2.0.0
>            Reporter: Xuefu Zhang
>            Assignee: Xuefu Zhang
>             Fix For: 3.0.0
>
>         Attachments: HIVE-16552.1.patch, HIVE-16552.2.patch, HIVE-16552.3.patch, HIVE-16552.4.patch,
HIVE-16552.patch
>
>
> It's commonly desirable to block bad and big queries that takes a lot of YARN resources.
One approach, similar to mapreduce.job.max.map in MapReduce, is to stop a query that invokes
a Spark job that contains too many tasks. The proposal here is to introduce hive.spark.job.max.tasks
with a default value of -1 (no limit), which an admin can set to block queries that trigger
too many spark tasks.
> Please note that this control knob applies to a spark job, though it's possible that
one query can trigger multiple Spark jobs (such as in case of map-join). Nevertheless, the
proposed approach is still helpful.



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