[jira] [Created] (CASSANDRA-20878) Improve Accord Observability

["Benedict Elliott Smith (Jira)" <ji...@apache.org>]

Benedict Elliott Smith created CASSANDRA-20878:
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             Summary: 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


    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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