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https://issues.apache.org/jira/browse/HADOOP-13651?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15625286#comment-15625286
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Steve Loughran commented on HADOOP-13651:
-----------------------------------------

bq. What needs to be done before we can commit this patch (besides the 
LOG.isDebugEnabled thing)? 

Well, it is just a branch, so it's not expected to be perfect.

What will happen is once the merge is in, the branch is going to have to be 
kept in sync with a piece of code which still has a major rate of change. 
Someone is going to have to volunteer to do that regularly, or share the 
workload. I'd recommend a process of:

# checkout and build trunk
# run the hadoop-aws integration tests on trunk
# if the tests all worked, checkout this branch, rebase onto it, rerun those 
integration tests
# if the tests didn't work: and they used to: consider reporting a problem, 
ideally after checking to see if something hasn't been opened already/your test 
setup hasn't regressed.

Step 2 makes sure that you don't rebase on broken code, and so get confused 
that test failures are your fault.

I'd recommend doing this weekly, or if there's been a big change gone into s3a. 
It's already time to do this, given the current difference between the branch 
and trunk

> S3Guard: S3AFileSystem Integration with MetadataStore
> -----------------------------------------------------
>
>                 Key: HADOOP-13651
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13651
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>            Reporter: Aaron Fabbri
>            Assignee: Aaron Fabbri
>         Attachments: HADOOP-13651-HADOOP-13345.001.patch, 
> HADOOP-13651-HADOOP-13345.002.patch, HADOOP-13651-HADOOP-13345.003.patch
>
>
> Modify S3AFileSystem et al. to optionally use a MetadataStore for metadata 
> consistency and caching.
> Implementation should have minimal overhead when no MetadataStore is 
> configured.



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