Dear HBASE developers,

We have a custom hbase filter that seeks (SEEK_NEXT_USING_HINT) to a next
column family (called "cf") based on data in a cell in a prior column
family (called "bf_slicing").

We upgraded to hbase 2.6.0 from 2.5.8, the change in this ticket
https://issues.apache.org/jira/browse/HBASE-27788 caused a
significant performance degradation. When comparing families here, the 'cf'
family is ordered lower than 'bf_slicing' due to its length, causing the
first column family ("bf_slicing") to be fully traversed.

The offending code is here:
https://github.com/apache/hbase/pull/5171/files#diff-1ec9654ed8e00f46e11430fc726f8351db59597723efa0bf1e268196f00244c6R54

The original story (HBASE_27788) mentions no seeking should be done outside
a column family, but our use case seems legitimate in the data model, so we
think this is a bug, or are we missing something? If this is a bug, I would
be happy to file a ticket or provide more information.

Thanks in advance,

Alejandro Acevedo and Bram Schuur

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