[jira] [Issue Comment Deleted] (HADOOP-16775) Hadoop DistCp reuses the same temp file within the task for different files.

["Amir Shenavandeh (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-16775?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Amir Shenavandeh updated HADOOP-16775:
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    Comment: was deleted

(was: The patch is for hadoop 2.10.0 add a timestamp to the temp file name. We can track the temp file based on the time it was created with in each attempt log.

in: [https://github.com/apache/hadoop/blob/release-2.10.0-RC1/hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/mapred/RetriableFileCopyCommand.java#L237]
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 )

> Hadoop DistCp reuses the same temp file within the task for different files.
> ----------------------------------------------------------------------------
>
>                 Key: HADOOP-16775
>                 URL: https://issues.apache.org/jira/browse/HADOOP-16775
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: tools/distcp
>    Affects Versions: 2.0
>            Reporter: Amir Shenavandeh
>            Priority: Major
>              Labels: DistCp, S3, hadoop-tools
>         Attachments: HADOOP-16775.patch
>
>
> Hadoop DistCp reuses the same temp file name for all the files copied within each task attempt and then moves them to the target name, which is also a server side copy. For copies to S3, this will cause inconsistency as S3 is only consistent for reads after writes, for brand new objects. There is also inconsistency for contents of overwritten objects on S3.
> To avoid this, we should randomize the temp file name and for each temp file use a different name.
>  



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