[GitHub] [hbase] saintstack commented on pull request #1613: HBASE-24273 HBCK's "Orphan Regions on FileSystem" reports regions wit…

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saintstack commented on pull request #1613:
URL: https://github.com/apache/hbase/pull/1613#issuecomment-622445584


   > There seems to be 3 sources of regions: FS, hbase:meta and in-memory. All of them need to be in sync, but what is the source of truth? Is it possible that the region is not in hbase:meta but is in in-memory state regionInfoMap? Could that be a good thing to validate in hbck?
   
   <ideal>Source of truth is Master in-memory. It has most up-to-date, comprehensive state. It effects change. Changes to state are orchestrated by the Master via the Procedures system. Procedures record intention and steps-taken in the Procedure store. When pertinent (changes that processes other-than master need to know of), Procedures publish state changes to hbase:meta (and for some state mostly internal to the cluster, to zk).</ideal>
   
   On crash, Master re-loads from persistent stores -- hbase:meta and the Procedure store -- and reconstructs the before-crash state.


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