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https://issues.apache.org/jira/browse/CASSANDRA-20774?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yuqi Yan updated CASSANDRA-20774:
---------------------------------
Fix Version/s: 4.1.x
5.0.x
> PaxosCleanup.isOutOfRange caused CPU util spikes in cluster on new node
> joining
> -------------------------------------------------------------------------------
>
> Key: CASSANDRA-20774
> URL: https://issues.apache.org/jira/browse/CASSANDRA-20774
> Project: Apache Cassandra
> Issue Type: Bug
> Reporter: Yuqi Yan
> Priority: Normal
> Fix For: 4.1.x, 5.0.x
>
> Attachments: image-2025-07-17-16-58-17-456.png
>
>
> Running Cassandra 4.1.3.
> After switching to PaxosV2 for one of our instances, we started to see that,
> when a new node attempted to join the ring, multiple nodes within the cluster
> started to have spike in CPU utils.
> I collected the CPU profile on one of them and seeing:
> !image-2025-07-17-16-58-17-456.png|width=1335,height=715!
>
> So after switching to V2, new node boostrapping will trigger
> `repairPaxosForTopologyChange` which will schedule `PaxosCleanup` table by
> table.
> Seems in `isOutOfRange` we're doing some unnecessary calculation to compute
> the token map for the whole cluster with `getAddressReplicas()` - then only
> use the local range.
>
> {code:java}
> localRanges = Range.normalize(keyspace.getReplicationStrategy()
> .getAddressReplicas()
> ^^^ this build the map for the
> entire cluster
>
> .get(FBUtilities.getBroadcastAddressAndPort())
> .ranges());{code}
> One potential improvement here is to reuse
> `getAddressReplicas(FBUtilities.getBroadcastAddressAndPort())` so we don't
> rebuild the whole map
> We're using 16 vnodes. Instance has ~1K tables.
> Though there is still significant load comes from `calculateNaturalReplicas`.
> Wondering is there any reason here we always recalculate this map instead of
> using the cached `EndpointsForRange` similar to `getNaturalReplicas`?
>
> The issue might not be there in trunk after we have ClusterMetadata
>
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