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https://issues.apache.org/jira/browse/CASSANDRA-15059?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16803221#comment-16803221
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Ariel Weisberg commented on CASSANDRA-15059:
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Well as part of this ticket. There is a question of scope. Yes this fixes the
bug, but it arguably doesn't address the reason the bug exists.
> Gossiper#markAlive can race with Gossiper#markDead
> --------------------------------------------------
>
> Key: CASSANDRA-15059
> URL: https://issues.apache.org/jira/browse/CASSANDRA-15059
> Project: Cassandra
> Issue Type: Bug
> Components: Cluster/Gossip
> Reporter: Blake Eggleston
> Assignee: Blake Eggleston
> Priority: Normal
>
> The Gossiper class is not threadsafe and assumes all state changes happen in
> a single thread (the gossip stage). Gossiper#convict, however, can be called
> from the GossipTasks thread. This creates a race where calls to
> Gossiper#markAlive and Gossiper#markDead can interleave, corrupting gossip
> state. Gossiper#assassinateEndpoint has a similar problem, being called from
> the mbean server thread.
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