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https://issues.apache.org/jira/browse/HDFS-6383?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13997211#comment-13997211
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David S. Wang commented on HDFS-6383:
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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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