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https://issues.apache.org/jira/browse/CASSANDRA-7758?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rick Branson updated CASSANDRA-7758:
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Attachment: 7758-1-v2.0.txt
> Some gossip messages are very slow to process on vnode clusters
> ---------------------------------------------------------------
>
> Key: CASSANDRA-7758
> URL: https://issues.apache.org/jira/browse/CASSANDRA-7758
> Project: Cassandra
> Issue Type: Bug
> Reporter: Rick Branson
> Assignee: Rick Branson
> Attachments: 7758-1-v1.2.txt, 7758-1-v2.0.txt
>
>
> Both StorageService.getChangedRangesForLeaving and
> PendingRangeCalculatorService.calculatePendingRanges clone the TokenMetadata
> map once per range that a node covers. This is a very expensive operation on
> a cluster with vnodes since the TokenMetadata map can easily be tens of
> thousands of entries, even for a small cluster, and this runs thousands of
> times for each changing node. This can cause big cluster-wide slowdowns &
> problems in the GossipStage and PendingRangeCalculator thread pools.
> Processing just one message can generate enough garbage to pause the entire
> cluster simultaneously when one of these is being propagated. Patches
> forthcoming.
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