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Posted to commits@cassandra.apache.org by "Marcus Eriksson (Jira)" <ji...@apache.org> on 2022/01/20 14:07:00 UTC

[jira] [Created] (CASSANDRA-17272) LeveledCompactionStrategy disk space check improvements

Marcus Eriksson created CASSANDRA-17272:
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             Summary: LeveledCompactionStrategy disk space check improvements
                 Key: CASSANDRA-17272
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-17272
             Project: Cassandra
          Issue Type: Bug
            Reporter: Marcus Eriksson
            Assignee: Marcus Eriksson


We currently allow reducing scope (removing sstables from the compaction) when starting STCS-in-L0 with LCS if the compaction is too large for the available disk space. We can do the same for L0 -> L1 compactions - but we can only remove L0 sstables to avoid causing overlap in L1.

Also, in 3.0, when starting an LCS compaction we try to [get a writeable location|https://github.com/apache/cassandra/blob/b1a8a56c563b85ab9a34d3bbf9c16278dd441157/src/java/org/apache/cassandra/db/compaction/writers/CompactionAwareWriter.java#L128] where the full result of the compaction will fit - here we should only get a directory where the first sstable fits, otherwise the compaction might fail even though there is enough space in total among the data directories 



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