Zheng Wang created HBASE-26884:
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Summary: Find unavailable regions by the startcode checking on
hmaster start up and reassign them
Key: HBASE-26884
URL: https://issues.apache.org/jira/browse/HBASE-26884
Project: HBase
Issue Type: Improvement
Components: master
Reporter: Zheng Wang
Assignee: Zheng Wang
Sometimes we have seen there are regions in open or opening state, but does not
deployed on any rs and without procs for them, and afting checking the meta
table, we find these startcode are expired.
It is no easy to reproduce, may be caused by corner bug or user misoperation.
My approach is add some checking on hmaster start up, if the startcode of the
regionLocation expired, and neither TRSP on region nor SCP on regionserver,
then we should reassign the region, then we can resovle it easily just by
restart hmaster.
Hbck2 maybe also useful for some of them cases, but not easily for common user
to use, especially the number of these regions not small and need to be
recovery quickly.
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