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Posted to issues@spark.apache.org by "Nong Li (JIRA)" <ji...@apache.org> on 2016/03/30 03:18:25 UTC

[jira] [Created] (SPARK-14259) Add config to control maximum number of files when coalescing partitions

Nong Li created SPARK-14259:
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             Summary: Add config to control maximum number of files when coalescing partitions
                 Key: SPARK-14259
                 URL: https://issues.apache.org/jira/browse/SPARK-14259
             Project: Spark
          Issue Type: Improvement
          Components: SQL
            Reporter: Nong Li
            Priority: Minor


The FileSourceStrategy currently has a config to control the maximum byte size of coalesced partitions. It is helpful to also have a config to control the maximum number of files as even small files have a non-trivial fixed cost. The current packing can put a lot of small files together which cases straggler tasks.



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