Jordan West created CASSANDRA-14207:
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Summary: Failed Compare and Swap in SASI's DataTracker#update Can
Lead to Improper Reference Counting of SSTableIndex
Key: CASSANDRA-14207
URL: https://issues.apache.org/jira/browse/CASSANDRA-14207
Project: Cassandra
Issue Type: Bug
Components: sasi
Reporter: Jordan West
Assignee: Jordan West
Attachments: sasi-invalid-reference-count.rtf
A race between e.g. Index Redistribution and Compaction can cause the compare
and swap of a new {{sasi.conf.View}} in {{sasi.conf.DataTracker#update}} to
fail, leading to recreation of the view and improper reference counting of an
{{SSTableIndex}}. This is because the side-effects (decrementing the reference
count via {{SStableIndex#release}}) occur regardless of if the view is promoted
to be the active view.
Code:
https://github.com/apache/cassandra/blob/cassandra-3.11.1/src/java/org/apache/cassandra/index/sasi/conf/DataTracker.java#L72-L78
Attached logs and debug output show case where index redistribution and
compaction race. This case was generated using the test provided in
https://issues.apache.org/jira/browse/CASSANDRA-14055
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