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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-15038) Abstract MetadataStore in S3Guard into a common module.
Date Fri, 17 Nov 2017 17:40:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-15038?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16257288#comment-16257288
] 

Steve Loughran commented on HADOOP-15038:
-----------------------------------------

Good point about placement. To date I've been adding dependency-less cross-store operations
into hadoop-common. But with things like my proposed  HADOOP-14766 cloudup function push for
us having a common hadoop-cloud-core module with

* common code
* cli entry point
* common (abstract/real) tests unique to stores (e.g. metastore ones here)

This is different from the pom only hadoop-cloud-components module which can pull in the various
cloud bindings: this would come above it. 

> 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: 3.0.0-beta1
>            Reporter: Genmao Yu
>
> 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).
[~stevel@apache.org] 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.
> [~stevel@apache.org] [~fabbri] [~drankye] Any suggestion is appreciated.



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