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Posted to issues@spark.apache.org by "Tang Yan (JIRA)" <ji...@apache.org> on 2015/09/09 10:38:45 UTC
[jira] [Updated] (SPARK-7825) Poor performance in Cross Product due
to no combine operations for small files.
[ https://issues.apache.org/jira/browse/SPARK-7825?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Tang Yan updated SPARK-7825:
----------------------------
Affects Version/s: (was: 1.3.1)
(was: 1.2.2)
(was: 1.2.1)
(was: 1.3.0)
(was: 1.2.0)
> Poor performance in Cross Product due to no combine operations for small files.
> -------------------------------------------------------------------------------
>
> Key: SPARK-7825
> URL: https://issues.apache.org/jira/browse/SPARK-7825
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Reporter: Tang Yan
>
> Dealing with Cross Product, if one table has many small files, spark sql has to handle so many tasks which will lead to poor performance, while Hive has a CombineHiveInputFormat which can combine small files to decrease the task number.
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