krconv commented on PR #7629:
URL: https://github.com/apache/hbase/pull/7629#issuecomment-3800369842

   From what I can tell it only affects HBase 2. It looks like the 
implementation was rewritten for HBase 3, replacing the 
`RegionReplicaReplicationEndpoint` with `RegionReplicationSink`. The new 
implementation in branch-3/master doesn't seem to suffer from this same issue, 
because the `RegionReplicationSink` has an immutable `TableDescriptor` (instead 
of attempting to periodically poll for table descriptor updates like the 
branch-2 implementation, branch-3/master recreate the sink when the region 
reopens) and so it can't hit a NPE when a table is dropped.


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