Aaron Fabbri updated HADOOP-13452:
    Attachment: HADOOP-13452-HADOOP-13345.002.patch

Ok, good tip on the Access Order option for LinkedHashMap, thanks [~liuml07]

I'm attaching a v2 patch.  Changes from v1:

- Absolute paths: Document and enforce that all paths must be absolute, as 
discussed on HADOOP-13448
- MetadataStore#initialize() takes a FileSystem, as discussed on HADOOP-13448
- Move synchronized keyword to method declaration when scope is whole function.
- Fix checkstyle issues / missing apache license on one file.

I kept the existing LruHashMap for LocalMetadataStore, but let me know if you 
guys want to change it.

> S3Guard: Implement access policy for intra-client consistency with in-memory 
> metadata store.
> --------------------------------------------------------------------------------------------
>                 Key: HADOOP-13452
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13452
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>            Reporter: Chris Nauroth
>            Assignee: Aaron Fabbri
>         Attachments: HADOOP-13452-HADOOP-13345.002.patch, 
> HADOOP-13452.001.patch
> Implement an S3A access policy based on an in-memory metadata store.  This 
> can provide consistency within the same client without needing to integrate 
> with an external system.

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