Feng Honghua created HBASE-9465:
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Summary: HLog entries are not pushed to peer clusters serially
when region-move or RS failure in master cluster
Key: HBASE-9465
URL: https://issues.apache.org/jira/browse/HBASE-9465
Project: HBase
Issue Type: Bug
Components: regionserver, Replication
Reporter: Feng Honghua
When region-move or RS failure occurs in master cluster, the hlog entries that
are not pushed before region-move or RS-failure will be pushed by original
RS(for region move) or another RS which takes over the remained hlog of dead
RS(for RS failure), and the new entries for the same region(s) will be pushed
by the RS which now serves the region(s), but they push the hlog entries of a
same region concurrently without coordination.
This treatment can possibly lead to data inconsistency between master and peer
clusters:
1. there are put and then delete written to master cluster
2. due to region-move / RS-failure, they are pushed by different
replication-source threads to peer cluster
3. if delete is pushed to peer cluster before put, and flush and major-compact
occurs in peer cluster before put is pushed to peer cluster, the delete is
collected and the put remains in peer cluster
In this scenario, the put remains in peer cluster, but in master cluster the
put is masked by the delete, hence data inconsistency between master and peer
clusters
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