Ariel Weisberg created CASSANDRA-14665:
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Summary: Support monotonic reads with Transient Replication
Key: CASSANDRA-14665
URL: https://issues.apache.org/jira/browse/CASSANDRA-14665
Project: Cassandra
Issue Type: Sub-task
Reporter: Ariel Weisberg
Fix For: 4.x
When transient replication is in use blocking read repair currently doesn't
repair transient replicas. While this results in transient replicas being
almost free as they don't have to accept 99% of write traffic and the
associated data it does mean that values returned by a read might not be
replicated to a majority of nodes.
If we enabled BRR to transient replicas we would get monotonic reads, but we
would have to BRR repaired and unrepaired data to them. This means we generally
wouldn't want to read from them to avoid extra BRR and if nodes are down and we
were forced to BRR them they could acquire a large amount of repaired data that
would then have to be streamed at the next incremental repair.
If we split read results into repaired and unrepaired data it will be possible
to only blocking read repair unrepaired data to transient replicas. Then we can
enable BRR for transient replicas without running into performance degradation
when nodes are down.
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