[jira] [Created] (CASSANDRA-19400) IndexStatusManager needs to prioritize SUCCESS over UNKNOWN states to maximize availability

["Caleb Rackliffe (Jira)" <ji...@apache.org>]

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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