Benedict Elliott Smith created CASSANDRA-20726:
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Summary: Accord: Fast Coordination Optimisations and Miscellaneous
Fixes
Key: CASSANDRA-20726
URL: https://issues.apache.org/jira/browse/CASSANDRA-20726
Project: Apache Cassandra
Issue Type: Improvement
Components: Accord
Reporter: Benedict Elliott Smith
Improve:
- Introduce SequentialAgentExecutor
- ExecuteEphemeralRead.LocalExecute (matching ExecuteTxn.LocalExecute)
- remove AgentExecutor (agent() only used as implementation detail)
- Skip CommandStore/CommandsForKey on read or apply, when safe to do so
- Implement maybeExecuteImmediately
Fix:
- Marking vestigial without knowing all covering keys
- Incorrect size in WaitingOn.none
- Cleanup RX that are not known but are no longer needed, due to being
defunct
- Home should not abort because of local truncation; may still be
incomplete on another shard
- Invalidate infinite loop due to interpreting Vestigial as a possible
decision (as though it were another Truncated state)
- Known.isTruncated reporting incorrect answer in some cases, leading to
infinite RecoverWithRoute loops as not slicing to correct subset and some
shards are truncated and reject the deps collection
- BurnTest slowCoordinatorDelay should grow with retryCount
- NotAccept should check both ballot and saveStatus; PreCommitted or later
can be propagated by Apply that has an earlier ballot
- Handle awaiting locally retired epoch
- Fix propagate low epoch of sync points
- Fix GetEphemeralReadDeps.reduce NPE
- Don't use tombstones to ERASE journal entries, as want to produce an
Erased SaveStatus until EXPUNGE
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