ZhaoYang created CASSANDRA-15761:
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Summary: Make SASI query safe for concurrent compaction
Key: CASSANDRA-15761
URL: https://issues.apache.org/jira/browse/CASSANDRA-15761
Project: Cassandra
Issue Type: Bug
Components: Feature/2i Index
Reporter: ZhaoYang
Read Request Thread:
1.) In {{QueryController#getIndexes}}, read request gets the current {{view}}
of sstable indexes.
2.) Request will try to reference the {{SSTableIndex}} from the {{view}} in
{{TermIterator#build}} and skips the {{SSTableIndex}} if it cannot be
referenced.
Compaction Thread:
If a compaction finishes between 1) and 2) and no other in-flight queries are
holding the sstable index reference, compacted {{SSTableIndex}} will be
released.
Then in step 2, read request will not be able to reference the released
{{SSTableIndex}}. We won't see a corruption error, but we'll silently not read
all data.
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Proposed fix: Read Request should make sure all {{SSTableIndexes}} from the
{{View}} can be referenced; if not, it should retry with latest {{View}}.
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