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https://issues.apache.org/jira/browse/HBASE-26481?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Duo Zhang updated HBASE-26481:
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Component/s: read replicas
> 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
> Components: read replicas
> Reporter: Duo Zhang
> Priority: Major
>
> 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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