Stefan Podkowinski created CASSANDRA-11684:
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Summary: Cleanup key ranges during compaction
Key: CASSANDRA-11684
URL: https://issues.apache.org/jira/browse/CASSANDRA-11684
Project: Cassandra
Issue Type: Improvement
Components: Compaction
Reporter: Stefan Podkowinski
Assignee: Stefan Podkowinski
Currently cleanup is considered an optional, manual operation that users are
told to run to free disk space after a node was affected by topology changes.
However, unmanaged key ranges could also end up on a node through other ways,
e.g. manual added sstable files by an admin or over streaming during repairs.
I'm also not sure unmanaged data is really that harmless and cleanup should
really be optional, if you don't need to reclaim the disk space. When it comes
to repairs, users are expected to purge a node after downtime in case it was
not fully covered by a repair within gc_grace afterwards, in order to avoid
re-introducing deleted data. But the same could happen with unmanaged data,
e.g. after topology changes activate unmanaged ranges again or after restoring
backups.
I'd therefor suggest to avoid rewriting key ranges no longer belonging to a
node and older than gc_grace during compactions.
Maybe we could also introduce another CLEANUP_COMPACTION operation to find
candidates based on SSTable.first/last in case we don't have pending regular or
tombstone compactions.
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