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Posted to common-dev@hadoop.apache.org by "Steve Loughran (JIRA)" <ji...@apache.org> on 2016/08/22 08:55:21 UTC

[jira] [Created] (HADOOP-13531) S3A output streams to share a single LocalDirAllocator for round-robin drive use

Steve Loughran created HADOOP-13531:
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             Summary: 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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