[GitHub] [hudi] minihippo commented on a change in pull request #4718: [HUDI-3345][RFC-36] Proposal for hudi metastore server.

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minihippo commented on a change in pull request #4718:
URL: https://github.com/apache/hudi/pull/4718#discussion_r809652381



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File path: rfc/rfc-36/rfc-36.md
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+# RFC-36: Hudi Metastore Server
+
+## Proposers
+
+- @minihippo
+
+## Approvers
+
+
+## Status
+
+JIRA: [HUDI-3345](https://issues.apache.org/jira/browse/HUDI-3345)
+
+> Please keep the status updated in `rfc/README.md`.
+
+# Hudi Metastore Server
+
+## Abstract
+
+Currently, Hudi is widely used as a table format in the data warehouse. There is a lack of central metastore server to manage the metadata of data lake table. Hive metastore as a commonly used catalog service in the data warehouse on Hadoop cannot store the unique metadata like timeline of the hudi table.
+
+The proposal is to implement an unified metadata management system called hudi metastore server to store the metadata of the hudi table, and be compatible with hive metastore so that other engines can access it without any changes.
+
+## Backgroud
+
+**How Hudi metadata is stored**
+
+The metadata of hudi are table location, configuration and schema, timeline generated by instants, metadata of each commit / instant, which records files created / updated, new records num and so on in this commit. Besides, the information of files in a hudi table is also a part of hudi metadata.

Review comment:
       File listing is covered by the metastore in the alpha version. Does column ranges mean statistics like min, max at column level?  Has plan to do it in the next version.




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