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From "Kai Zheng (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-15038) Abstract MetadataStore in S3Guard into a common module.
Date Mon, 04 Dec 2017 02:56:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-15038?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16276234#comment-16276234

Kai Zheng commented on HADOOP-15038:

Thanks for the discussion, folks.

The idea to extract MetadataStore into a Hadoop common module sounds good to me, but when
do it, we should be careful not to introduce non-trivial dependencies.

[~stevel@apache.org] it looks to me the cloudup package would be a good fit for the new module.
Could you introduce the new module when do the work of HADOOP-14766? If nice, how to name
the module (under hadoop-common-project)? IMO hadoop-cloud-common might be better, sure hadoop-cloud-core
is also good to me.

[~ajfabbri] do you have any concerns if the main work of MetadataStore is extracted and put
into hadoop-common-project/hadoop-cloud-common? 

Not sure if [~chris.douglas] would have more thoughts on this.


> 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
> 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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