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https://issues.apache.org/jira/browse/HADOOP-15038?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16784320#comment-16784320
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Steve Loughran commented on HADOOP-15038:
-----------------------------------------

Keep an eye on HADOOP-15619

in particular, the bit where I don't think it's experimental HADOOP-14936

now, before that, if you had an uncommitted branch of the OSS connector which 
imported the metastore stuff from hadoop-aws just to test, would that work? 
Because that would help catch regression tests &c with that work as it goes on.

(Now that Alibaba is opening up DCs in EU, I should get an account. And with 
the purchase of the Flink Dev team in berlin, recruit some more testers for 
this code)

> Abstract MetadataStore in S3Guard into a common module.
> -------------------------------------------------------
>
>                 Key: HADOOP-15038
>                 URL: https://issues.apache.org/jira/browse/HADOOP-15038
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: fs
>    Affects Versions: 3.2.0, 2.9.2, 3.0.3, 3.1.2
>            Reporter: Genmao Yu
>            Assignee: wujinhu
>            Priority: Major
>         Attachments: HADOOP-15038.001.patch
>
>
> Open this JIRA to discuss if we should move {{MetadataStore}} in {{S3Guard}} 
> into a common module. 
> Based on this work, other filesystem or object store can implement their own 
> metastore for optimization (known issues like consistency problem and 
> metadata operation performance). [[email protected]] and other guys have 
> done many base and great works in {{S3Guard}}. It is very helpful to start 
> work. I did some perf test in HADOOP-14098, and started related work for 
> Aliyun OSS.  Indeed there are still works to do for {{S3Guard}}, like 
> metadata cache inconsistent with S3 and so on. It also will be a problem for 
> other object store. However, we can do these works in parallel.
> [[email protected]] [~fabbri] [~drankye] Any suggestion is appreciated.



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