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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2014/09/30 05:30:33 UTC

[jira] [Commented] (SPARK-3739) Too many splits for small source file in table scanning

    [ https://issues.apache.org/jira/browse/SPARK-3739?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14152762#comment-14152762 ] 

Apache Spark commented on SPARK-3739:
-------------------------------------

User 'chenghao-intel' has created a pull request for this issue:
https://github.com/apache/spark/pull/2589

> Too many splits for small source file in table scanning
> -------------------------------------------------------
>
>                 Key: SPARK-3739
>                 URL: https://issues.apache.org/jira/browse/SPARK-3739
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>            Reporter: Cheng Hao
>            Priority: Minor
>
> Source file input split is probably better based on block on HDFS for table scanning, other than the settings of 'mapred.reducer.tasks' or 'taskScheduler.defaultParallelism', see [http://grepcode.com/file/repository.cloudera.com/content/repositories/releases/org.apache.hadoop/hadoop-core/2.3.0-mr1-cdh5.1.0/org/apache/hadoop/mapred/FileInputFormat.java#203].
> Currently, it seems too many splits for small source file.



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