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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-10610) Upgrade S3n s3.fs.buffer.dir to suppoer multi directories
Date Fri, 16 May 2014 11:22:59 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-10610?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13998569#comment-13998569
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Steve Loughran commented on HADOOP-10610:
-----------------------------------------

The overall concept makes sense

# {{LocalDirAllocator}} contains the logic to worry about file capacity, writeability &c.
The more disks you list, the more likely a disk is to fail, the more you need that code. This
patch currently just bails out if one dest dir isn't there, even if others may be present.
# This would be an ideal time to move {{"fs.s3.buffer.dir"}} from an inline string to a constant
where it can be referred to in hadoop and external code

Recommended tests 
# a test with > 1 directory in the args
# basic handling of "erroneous" inputs. e.g trailing commas in options
# bad directories in input paths

> 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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