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Duo Zhang commented on HBASE-20881: ----------------------------------- {quote} SCP cannot be certain what step of the previous TRSP, the region was stuck in while it was in RIT. {quote} Could you please provide an example about this? I do not get the point, if there is a SCP for the server, and it executes normally, the related TRSP should be finished normally too. And SCP will not create new TRSPs, it just reuse the current TRSP, as a TRSP can not fail, unless you use hbck to bypass it. So I guess the problem here is still about strange RS behaviors, i.e, the RS is in the live server list, but you can not assign a region to it, and finally cause the TRSP hangs there forever. Thanks. > Introduce a region transition procedure to handle all the state transition > for a region > --------------------------------------------------------------------------------------- > > Key: HBASE-20881 > URL: https://issues.apache.org/jira/browse/HBASE-20881 > Project: HBase > Issue Type: Sub-task > Components: amv2, proc-v2 > Reporter: Duo Zhang > Assignee: Duo Zhang > Priority: Major > Fix For: 3.0.0-alpha-1, 2.2.0 > > Attachments: HBASE-20881-branch-2-v1.patch, > HBASE-20881-branch-2-v2.patch, HBASE-20881-branch-2.patch, > HBASE-20881-v1.patch, HBASE-20881-v10.patch, HBASE-20881-v11.patch, > HBASE-20881-v12.patch, HBASE-20881-v13.patch, HBASE-20881-v13.patch, > HBASE-20881-v14.patch, HBASE-20881-v14.patch, HBASE-20881-v15.patch, > HBASE-20881-v16.patch, HBASE-20881-v2.patch, HBASE-20881-v3.patch, > HBASE-20881-v4.patch, HBASE-20881-v4.patch, HBASE-20881-v5.patch, > HBASE-20881-v6.patch, HBASE-20881-v7.patch, HBASE-20881-v7.patch, > HBASE-20881-v8.patch, HBASE-20881-v9.patch, HBASE-20881.patch > > > Now have an AssignProcedure, an UnssignProcedure, and also a > MoveRegionProcedure which schedules an AssignProcedure and an > UnssignProcedure to move a region. This makes the logic a bit complicated, as > MRP is not a RIT, so when SCP can not interrupt it directly... -- This message was sent by Atlassian Jira (v8.20.10#820010)