Rick Branson created CASSANDRA-7758:
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Summary: 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
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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