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https://issues.apache.org/jira/browse/CASSANDRA-20878?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Benedict Elliott Smith updated CASSANDRA-20878:
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Resolution: Fixed
Status: Resolved (was: Triage Needed)
> Improve Accord Observability
> ----------------------------
>
> Key: CASSANDRA-20878
> URL: https://issues.apache.org/jira/browse/CASSANDRA-20878
> Project: Apache Cassandra
> Issue Type: Improvement
> Components: Accord
> Reporter: Benedict Elliott Smith
> Priority: Normal
>
> Improve Observability:
> - Track all active Coordinations
> - Refactor Replica/Coordinator metrics and report Coordinator
> exhausted/preempted/timeout
> - DurabilityQueue metrics and visibility
> Also Fix:
> - WaitingState can get cause distributed stall when asked to wait for
> CanApply if not yet PreCommitted; track separate querying state and advance
> this to the next achievable state rather than the desired final state
> - Stalled coordinators should not prevent recovery
> - Edge case with fetch unable to make progress when pre-bootstrap and
> all peers have GC'd
> - Dependency initialisation for sync points across certain ownership
> changes
> - SyncPoint propagation may not include all of the epochs required on
> the receiving node for ranges they have lost but not closed, and receiving
> node does not validate them
> - Stable tracker accounting with LocalExecute
> - Do not prune non-durable APPLIED as must be reported in dependencies
> until durably applied (so as not to break recovery)
> - Ensure we cannot race with replies when initiating Coordination
> - ProgressLog does not guarantee to clear home or waiting states when
> erased or invalidated by compaction
> - WaitingState on non-home shard cannot guarantee progress once home
> shard is Erased
> - WaitingOnSync handles retired ranges incorrectly
> Also Improve:
> - Standardise failure accounting, use null to represent single reply
> timeouts
> - BurnTest record/replay to/from file
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