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https://issues.apache.org/jira/browse/CASSANDRA-15027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16770869#comment-16770869
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Stefan Podkowinski commented on CASSANDRA-15027:
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* [ [trunk|https://github.com/spodkowinski/cassandra/tree/CASSANDRA-15027] ][
[circleci|https://circleci.com/workflow-run/2b027f87-cf45-48ee-8eae-45a563701bc6]
]
> Handle IR prepare phase failures less race prone by waiting for all results
> ---------------------------------------------------------------------------
>
> Key: CASSANDRA-15027
> URL: https://issues.apache.org/jira/browse/CASSANDRA-15027
> Project: Cassandra
> Issue Type: Bug
> Components: Consistency/Repair, Local/Compaction
> Reporter: Stefan Podkowinski
> Assignee: Stefan Podkowinski
> Priority: Major
> Fix For: 4.x
>
>
> Handling incremental repairs as a coordinator begins by sending a
> {{PrepareConsistentRequest}} message to all participants, which may also
> include the coordinator itself. Participants will run anti-compactions upon
> receiving such a message and report the result of the operation back to the
> coordinator.
> Once we receive a failure response from any of the participants, we fail-fast
> in {{CoordinatorSession.handlePrepareResponse()}}, which will in turn
> completes the {{prepareFuture}} that {{RepairRunnable}} is blocking on. Then
> the repair command will terminate with an error status, as expected.
> The issue is that in case the node will both be coordinator and participant,
> we may end up with a local session and submitted anti-compactions, which will
> be executed without any coordination with the coordinator session (on same
> node). This may result in situations where running repair commands right
> after another, may cause overlapping execution of anti-compactions that will
> cause the following (misleading) message to show up in the logs and will
> cause the repair to fail again:
> "Prepare phase for incremental repair session %s has failed because it
> encountered intersecting sstables belonging to another incremental repair
> session (%s). This is by starting an incremental repair session before a
> previous one has completed. Check nodetool repair_admin for hung sessions and
> fix them."
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