[jira] [Created] (CASSANDRA-13994) Remove COMPACT STORAGE internals before 4.0 release

["Alex Petrov (JIRA)" <ji...@apache.org>]

Alex Petrov created CASSANDRA-13994:
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             Summary: Remove COMPACT STORAGE internals before 4.0 release
                 Key: CASSANDRA-13994
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13994
             Project: Cassandra
          Issue Type: Improvement
            Reporter: Alex Petrov
            Assignee: Alex Petrov
            Priority: Blocker
             Fix For: 4.0


4.0 comes without thrift (after [CASSANDRA-11115]) and COMPACT STORAGE (after [CASSANDRA-10857]), and since Compact Storage flags are now disabled, all of the related functionality is useless.

There are still some things to consider:
1. One of the system tables (built indexes) was compact. For now, we just added {{value}} column to it to make sure it's backwards-compatible, but we might want to make sure it's just a "normal" table and doesn't have redundant columns.
2. Compact Tables were building indexes in {{KEYS}} mode. Removing it is trivial, but this would mean that all built indexes will be defunct. We could log a warning for now and ask users to migrate off those for now and completely remove it from future releases. It's just a couple of classes though.



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