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https://issues.apache.org/jira/browse/CASSANDRA-21427?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18085946#comment-18085946
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Yuqi Yan commented on CASSANDRA-21427:
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4.1 PR: [https://github.com/apache/cassandra/pull/4861]
> UnsupportedOperationException on live node check in PaxosRepair
> ---------------------------------------------------------------
>
> Key: CASSANDRA-21427
> URL: https://issues.apache.org/jira/browse/CASSANDRA-21427
> Project: Apache Cassandra
> Issue Type: Bug
> Components: Observability/Logging
> Reporter: Yuqi Yan
> Assignee: Yuqi Yan
> Priority: Normal
> Fix For: 4.1.x
>
>
> {code:java}
> j.l.UnsupportedOperationException: null at
> o.a.c.l.AbstractReplicaCollection$ReplicaMap$AbstractImmutableSet.removeAll(AbstractReplicaCollection.java:298)
> at
> o.a.c.s.ActiveRepairService.repairPaxosForTopologyChange(ActiveRepairService.java:1088)
> {code}
> Attempting to remove elements from immutable set caused this
> UnsupportedOperationException - swallowed the error message for "Insufficient
> live nodes to repair paxos check".
> Not a harmful one but did make log reading less straightfoward
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