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https://issues.apache.org/jira/browse/SPARK-4341?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14207899#comment-14207899
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Hong Shen commented on SPARK-4341:
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My main point is when running spark (especially spark SQL), not all user want
to set parallelism to match executors, we can provide a easy way for them to
use spark.
> Spark need to set num-executors automatically
> ---------------------------------------------
>
> Key: SPARK-4341
> URL: https://issues.apache.org/jira/browse/SPARK-4341
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 1.1.0
> Reporter: Hong Shen
>
> The mapreduce job can set maptask automaticlly, but in spark, we have to set
> num-executors, executor memory and cores. It's difficult for users to set
> these args, especially for the users want to use spark sql. So when user
> havn't set num-executors, spark should set num-executors automatically
> accroding to the input partitions.
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