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Posted to issues@spark.apache.org by "drow blonde messi (JIRA)" <ji...@apache.org> on 2016/08/26 09:14:21 UTC
[jira] [Commented] (SPARK-6221) SparkSQL should support auto
merging output files
[ https://issues.apache.org/jira/browse/SPARK-6221?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15438701#comment-15438701 ]
drow blonde messi commented on SPARK-6221:
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Hi guys, I want to know why this issue WON'T be fixed?
> SparkSQL should support auto merging output files
> -------------------------------------------------
>
> Key: SPARK-6221
> URL: https://issues.apache.org/jira/browse/SPARK-6221
> Project: Spark
> Issue Type: New Feature
> Components: SQL
> Reporter: Yi Tian
>
> Hive has a feature that could automatically merge small files in HQL's output path.
> This feature is quite useful for some cases that people use {{insert into}} to handle minute data from the input path to a daily table.
> In that case, if the SQL includes {{group by}} or {{join}} operation, we always set the {{reduce number}} at least 200 to avoid the possible OOM in reduce side.
> That will cause this SQL output at least 200 files at the end of the execution. So the daily table will finally contains more than 50000 files.
> If we could provide the same feature in SparkSQL, it will extremely reduce hdfs operations and spark tasks when we run other sql on this table.
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