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https://issues.apache.org/jira/browse/CASSANDRA-21791?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Blake Eggleston updated CASSANDRA-21791:
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Bug Category: Parent values: Availability(12983)
Complexity: Normal
Component/s: Consistency/Coordination
Discovered By: User Report
Severity: Normal
Status: Open (was: Triage Needed)
> CEP-45 - improve tracked read coordination
> ------------------------------------------
>
> Key: CASSANDRA-21791
> URL: https://issues.apache.org/jira/browse/CASSANDRA-21791
> Project: Apache Cassandra
> Issue Type: Bug
> Components: Consistency/Coordination
> Reporter: Blake Eggleston
> Assignee: Blake Eggleston
> Priority: Normal
>
> The tracked read coordinator currently waits for all peers to send it both
> their initial summaries and their acknowledgement that they’ve received any
> mutations they were missing. This is the network equivalent of running read
> repair for every read. This patch improves read completion by:
> * Not waiting for sync acks from nodes we know are up to date. We know which
> writes each peer is missing from their initial summary, if we can see that
> they’re not behind, we no longer wait for them to send sync acknowledgements.
> * Sending per-peer sync acks. Peers currently wait to receive all mutations
> they’re missing from all other peers before notifying the coordinator. This
> send an ack per-peer
> * Accounting for mutations received between local summary creation and remove
> summary receipt
> * Eager quorum completion - both of these improvements allow us to be more
> intelligent about how we decide we’ve reached quorum. If a quorum exists that
> we can satisfy immediately (for instance, 1/3 non data nodes is reporting a
> mutation none of the other peers have seen, we can skip syncing and returning
> that mutation while preserving monotonicity)
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