Caleb Rackliffe created CASSANDRA-19400:
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Summary: IndexStatusManager needs to prioritize SUCCESS over
UNKNOWN states to maximize availability
Key: CASSANDRA-19400
URL: https://issues.apache.org/jira/browse/CASSANDRA-19400
Project: Cassandra
Issue Type: Improvement
Components: Feature/SAI
Reporter: Caleb Rackliffe
{{IndexStatusManager}} is responsible for knowing what SAI indexes are
queryable across the ring, endpoint by endpoint. There are two statuses that
SAI treats as queryable, but it should not treat them equally.
{{BUILD_SUCCEEDED}} means the index is definitely available and should be able
to serve queries without issue. {{UNKNOWN}} indicates that the status of the
index hasn’t propagated yet to this coordinator. It may be just fine, or it may
not be. If it isn’t a query will not return incorrect results, but it will
fail. If there are enough {{BUILD_SUCCEEDED}} replicas, we should ignore
{{UNKNOWN}} replicas and maximize availability. If the UNKNOWN replica is going
to become {{BUILD_SUCCEEDED}} shortly, it will happily start taking requests at
that point and spread the load. If not, we’ll avoid futile attempts to query it
too early.
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