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https://issues.apache.org/jira/browse/HADOOP-13531?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15430351#comment-15430351
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Steve Loughran commented on HADOOP-13531:
-----------------------------------------
May need to add a new unit test for this if we want to verify round-robin use;
otherwise, regression testing.
> 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
> Priority: Minor
>
> {{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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