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https://issues.apache.org/jira/browse/HADOOP-13530?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15430225#comment-15430225
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Adrian Muraru commented on HADOOP-13530:
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Actually I see branch-2 starts deprecating s3:// so we might not need this
feature at all.
HADOOP-12709
> Upgrade S3 fs.s3.buffer.dir to support multi directories
> --------------------------------------------------------
>
> Key: HADOOP-13530
> URL: https://issues.apache.org/jira/browse/HADOOP-13530
> Project: Hadoop Common
> Issue Type: Improvement
> Components: fs/s3
> Affects Versions: 2.4.0
> Reporter: Adrian Muraru
> Assignee: Ted Malaska
> Priority: Minor
>
> fs.s3.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 is similar to HADOOP-10610 but applies to {{s3://}} hadoop block fs.
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