Caleb Rackliffe created CASSANDRA-19968:
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Summary: Partition-restricted index and queries that use strict
replica filtering can use SinglePartitionReadCommand
Key: CASSANDRA-19968
URL: https://issues.apache.org/jira/browse/CASSANDRA-19968
Project: Cassandra
Issue Type: Improvement
Components: Consistency/Coordination, Feature/2i Index, Feature/SAI
Reporter: Caleb Rackliffe
Assignee: Caleb Rackliffe
Index and filtering queries have historically always been treated as range
reads. However, when they are restricted to a partition, there is no reason
they cannot be handled like single-partition reads, flowing through
{{StorageProxy#fetchRows()}}. The benefit of doing this is that we may be able
to take advantage of digest reads. The caveat is that this may not be possible
(or worthwhile) when, for instance, SAI queries do not use strict filtering.
When strict filtering is not active, we may need to filter combined replica
results at the coordinator even when there isn’t a digest mismatch. When there
is a digest mismatch, replica filtering protection will kick in during the read
repair process and safely resolve this.
tl;dr We can safely treat partition-restricted index/SAI/filtering queries as
single-partition reads, but initially it may be safest to do this only when
strict filtering is enabled.
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