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From "David S. Wang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6383) Upgrade S3n s3.fs.buffer.dir to suppoer multi directories
Date Wed, 14 May 2014 02:42:14 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6383?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13997211#comment-13997211
] 

David S. Wang commented on HDFS-6383:
-------------------------------------

Thanks Ted for the patch.

We should probably use the LocalDirAllocator like what s3a uses.  That seems to be the proper
way to do this in Hadoop.

> Upgrade S3n s3.fs.buffer.dir to suppoer multi directories
> ---------------------------------------------------------
>
>                 Key: HDFS-6383
>                 URL: https://issues.apache.org/jira/browse/HDFS-6383
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>    Affects Versions: 2.4.0
>            Reporter: Ted Malaska
>            Assignee: Ted Malaska
>            Priority: Minor
>         Attachments: HDFS-6383.patch
>
>
> s3.fs.buffer.dir defines the tmp folder where files will be written to before getting
sent to S3.  Right now this is limited to a single folder which causes to major issues.
> 1. You need a drive with enough space to store all the tmp files at once
> 2. You are limited to the IO speeds of a single drive
> This solution will resolve both and has been tested to increase the S3 write speed by
2.5x with 10 mappers on hs1.



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