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https://issues.apache.org/jira/browse/SPARK-15247?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15278288#comment-15278288
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Takeshi Yamamuro commented on SPARK-15247:
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You tried this in master? Seems this issue has been fixed there; small files
are packed into a single partition. Please check
https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/FileSourceStrategy.scala#L46
> sqlCtx.read.parquet yields at least n_executors * n_cores tasks
> ---------------------------------------------------------------
>
> Key: SPARK-15247
> URL: https://issues.apache.org/jira/browse/SPARK-15247
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.6.0
> Reporter: Johnny W.
>
> sqlCtx.read.parquet always yields at least n_executors * n_cores tasks, no
> matter how small the input file is.
> This issue can increase the latency for small jobs.
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