Duo Zhang created HBASE-26481:
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Summary: Consider rolling upgrading from old region replication
framework
Key: HBASE-26481
URL: https://issues.apache.org/jira/browse/HBASE-26481
Project: HBase
Issue Type: Sub-task
Reporter: Duo Zhang
In the old implementation, we will cerate a replication peer for region
replication. And in the new framework, we do not need the peer any more, so we
have deleted the RegionReplicaReplicationEndpoint class.
But when rolling upgrading, the peer is still there so we will try to load it
and it will lead to a class not found exception. We need to handle it.
And during the upgrading, some of the region servers may not have the correct
replicateToReplica method yet. Maybe we could try to catch the no such method
error and try to fallback to use replay method. Although it is not perfect, but
finally a flush can fix everything.
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