[jira] [Created] (CASSANDRA-14935) PendingAntiCompaction should be more judicious in the compactions it cancels

["Marcus Eriksson (JIRA)" <ji...@apache.org>]

Marcus Eriksson created CASSANDRA-14935:
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             Summary: PendingAntiCompaction should be more judicious in the compactions it cancels
                 Key: CASSANDRA-14935
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14935
             Project: Cassandra
          Issue Type: Improvement
            Reporter: Marcus Eriksson
             Fix For: 4.0


PendingAntiCompaction currently cancels all ongoing compactions to be able to grab the sstables it requires - it should;

* avoid stopping ongoing anticompactions - for example, if we have an sstable [0, 100] and are anticompacting it on [0, 50] - now if we start a new incremental repair on [51, 100] we will (try to) stop the first one. Instead we should fail the new incremental repair request.
* avoid stopping unrelated regular compactions - we should only stop regular compactions for the sstables the new anticompaction needs

This requires us to keep track of which sstables are being compacted by a given compaction id.



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