Branimir Lambov created CASSANDRA-18342:
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Summary: Race in sstable tracking can cause sstables to never be
compacted
Key: CASSANDRA-18342
URL: https://issues.apache.org/jira/browse/CASSANDRA-18342
Project: Cassandra
Issue Type: Bug
Components: Local/Compaction
Reporter: Branimir Lambov
The sstable tracking by the compaction strategies permits a race between an
sstable is added and removed that can cause a removed sstable to remain in the
tracked list (when the add notification is received after the removal).
This can cause reference leaks, because such {{SSTableReader}} s remain in the
list forever, but if a strategy does not filter its sstable list through the
live list (e.g. LCS in some code paths) it can also cause sstables that end up
being selected to compact with these zombies to never compact (indicated by a
"Could not acquire references for compacting SSTables..." message).
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