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https://issues.apache.org/jira/browse/SPARK-12619?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-12619.
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Resolution: Duplicate
> Combine small files in a hadoop directory into single split
> ------------------------------------------------------------
>
> Key: SPARK-12619
> URL: https://issues.apache.org/jira/browse/SPARK-12619
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Reporter: Navis
> Priority: Trivial
>
> When a directory contains too many (small) files, whole spark cluster will be
> exhausted scheduling tasks created for each file. Custom input format can
> handle that but if you're using hive metastore, it could hardly be an option.
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