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https://issues.apache.org/jira/browse/SPARK-15530?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15309240#comment-15309240
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Yin Huai commented on SPARK-15530:
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Your change looks reasonable. How about we just take the value of
sparkSession.sessionState.conf.parallelPartitionDiscoveryThreshold? We can
change the doc of this conf and increate the default value.
> Partitioning discovery logic HadoopFsRelation should use a higher setting of
> parallelism
> ----------------------------------------------------------------------------------------
>
> Key: SPARK-15530
> URL: https://issues.apache.org/jira/browse/SPARK-15530
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Reporter: Yin Huai
>
> At
> https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/fileSourceInterfaces.scala#L418,
> we launch a spark job to do parallel file listing in order to discover
> partitions. However, we do not set the number of partitions at here, which
> means that we are using the default parallelism of the cluster. It is better
> to set the number of partitions explicitly to generate smaller tasks, which
> help load balancing.
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