z-york commented on pull request #3447:
URL: https://github.com/apache/hbase/pull/3447#issuecomment-875040079
@Apache9 @virajjasani Sorry, I was out for the holiday. I understand that
this is a special region and it does not have a corresponding table/namespace
created for it. We do have an internal patch/feature that makes use of the
system table designation (see HBASE-18477). We block writes/updates for user
tables, but not system tables (HBASE-18775). Without this flag being set,
writes to the master local region will be blocked with our feature. Originally
the system table status was stored in the HRegionInfo, but now only the Table
knows if it is a system table or not.
I can add a hack/hardcode a check for the master local region. However, it
still seems like this is technically a system region? In that case, why would
we not denote it as a system region? It certainly is not in the user's domain,
it is an internal HBase region.
I'm fine with not adding this to the reserved NS list/restricting creating
the NS, but to me it still seems like it is a bug that this "table" (really
region) isn't being considered a system table.
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