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From "Hyukjin Kwon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-25293) Dataframe write to csv saves part files in outputDireotry/task-xx/part-xxx instead of directly saving in outputDir
Date Tue, 04 Sep 2018 01:41:00 GMT

    [ https://issues.apache.org/jira/browse/SPARK-25293?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16602528#comment-16602528
] 

Hyukjin Kwon commented on SPARK-25293:
--------------------------------------

[~omkar999], would you be able to test this and see if the issue still exists in the upper
Spark version?

> Dataframe write to csv saves part files in outputDireotry/task-xx/part-xxx instead of
directly saving in outputDir
> ------------------------------------------------------------------------------------------------------------------
>
>                 Key: SPARK-25293
>                 URL: https://issues.apache.org/jira/browse/SPARK-25293
>             Project: Spark
>          Issue Type: Bug
>          Components: EC2, Java API, Spark Shell, Spark Submit
>    Affects Versions: 2.0.2
>            Reporter: omkar puttagunta
>            Priority: Major
>
> [https://stackoverflow.com/questions/52108335/why-spark-dataframe-writes-part-files-to-temporary-in-instead-directly-creating]
> {quote}Running Spark 2.0.2 in Standalone Cluster Mode; 2 workers and 1 master node on
AWS EC2
> {quote}
> Simple Test; reading pipe delimited file and writing data to csv. Commands below are
executed in spark-shell with master-url set
> {{val df = spark.sqlContext.read.option("delimiter","|").option("quote","\u0000").csv("/home/input-files/")
val emailDf=df.filter("_c3='EML'") emailDf.repartition(100).write.csv("/opt/outputFile/")}}
> After executing the cmds above in spark-shell with master url set.
> {quote}In {{worker1}} -> Each part file is created in\{{/opt/outputFile/_temporary/task-xxxxx-xxx/part-xxx-xxx}}
>  In {{worker2}} -> {{/opt/outputFile/part-xxx}} => part files are generated
directly under outputDirectory specified during write.
> {quote}
> *Same thing happens with coalesce(100) or without specifying repartition/coalesce!!!
Tried with Java also!*
> *_Quesiton_*
> 1) why {{worker1}} {{/opt/outputFile/}} output directory doesn't have {{part-xxxx}} files
just like in {{worker2}}? why {{_temporary}} directory is created and {{part-xxx-xx}} files
reside in the \{{task-xxx}}directories?



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