Viraj Jasani created HBASE-24795:
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Summary: RegionMover should deal with unknown (split/merged)
regions
Key: HBASE-24795
URL: https://issues.apache.org/jira/browse/HBASE-24795
Project: HBase
Issue Type: New Feature
Reporter: Viraj Jasani
For a cluster with very high load, it is quite common to see flush/compaction
happening every minute on each RegionServer. And we have quite high chances of
multiple regions going through splitting/merging.
RegionMover, while unloading all regions (graceful stop), writes down all
regions to a local file and while loading them back (graceful start), ensures
to bring every single region back from other RSs. While loading regions back,
even if a single region can't be moved back, RegionMover considers load()
failure. We miss out on possibilities of some regions going through split/merge
process and the fact that not all regions written to local file might even
exist anymore. Hence, RegionMover should gracefully handle moving any unknown
region without marking load() failed.
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