[jira] [Created] (HADOOP-15038) Abstract {{MetadataStore}} in {{S3Guard}} into a common module.

["Genmao Yu (JIRA)" <ji...@apache.org>]

Genmao Yu created HADOOP-15038:
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             Summary: 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.

cc [~drankye]



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