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https://issues.apache.org/jira/browse/SPARK-4341?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14207816#comment-14207816
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Hong Shen edited comment on SPARK-4341 at 11/12/14 8:40 AM:
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After the first action computed, we can set nimPartition for the following
HadoopRDD.
So the following HadoopRDD's partitions won't less than num-executors, and it
will prevent wasting of resources. On the other hand if the following
HadoopRDD's partitions is much bigger than num-executors, we can reset
numExecuors to ApplicaitonMaster and allocate new executors.
was (Author: shenhong):
After the first action computed, we can set set nimPartition for the following
HadoopRDD.
So the following HadoopRDD's partitions won't less than num-executors, and it
will prevent wasting of resources. On the other hand if the following
HadoopRDD's partitions is much bigger than num-executors, we can reset
numExecuors to ApplicaitonMaster and allocate new executors.
> 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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