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https://issues.apache.org/jira/browse/HADOOP-13531?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15512722#comment-15512722
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Steve Loughran commented on HADOOP-13531:
-----------------------------------------

this is probably superceded by HADOOP-13560

> S3A output streams to share a single LocalDirAllocator for round-robin drive 
> use
> --------------------------------------------------------------------------------
>
>                 Key: HADOOP-13531
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13531
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>    Affects Versions: 2.8.0
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Minor
>         Attachments: HADOOP-13531-001.patch
>
>
> {{S3AOutputStream}} uses {{LocalDirAllocator}} to choose a directory from the 
> comma-separated list of buffers —but it creates a new instance for every 
> output stream. This misses a key point of the allocator: for it to do 
> round-robin allocation, it needs to remember the last disk written to. If a 
> new instance is used for every file: no history.



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