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From "Andrew Wang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-10610) Upgrade S3n s3.fs.buffer.dir to suppoer multi directories
Date Sat, 17 May 2014 00:26:15 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-10610?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14000554#comment-14000554
] 

Andrew Wang commented on HADOOP-10610:
--------------------------------------

Hey Ted,

Note that we already have Configuration.getTrimmedStrings, no need to split yourself, and
thus no need to write unit tests for splitting logic :)

> Upgrade S3n s3.fs.buffer.dir to suppoer multi directories
> ---------------------------------------------------------
>
>                 Key: HADOOP-10610
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10610
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: fs/s3
>    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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