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https://issues.apache.org/jira/browse/CASSANDRA-6127?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13804459#comment-13804459
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Quentin Conner commented on CASSANDRA-6127:
-------------------------------------------
First results with workaround patch #2.
No load. No data. Only system keyspace and Gossip on a 256 node m1.medium
cluster in EC2.
Nodes started in rapid succession.
*phi=8, variable gossip_period*
1154 flaps for 1 sec
685 flaps for 2 sec
146 flaps for 3 sec
88 flaps for 4 sec
70 flaps for 5 sec
100 flaps for 10 sec
*phi=12*
1289 flaps for 1 sec
77 flaps for 2 sec
6 flaps for 3 sec
1 flaps for 4 sec
3 flaps for 5 sec
1 flaps for 6 sec
0 flaps for 8 sec
1 flaps for 10 sec
> vnodes don't scale to hundreds of nodes
> ---------------------------------------
>
> Key: CASSANDRA-6127
> URL: https://issues.apache.org/jira/browse/CASSANDRA-6127
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Environment: Any cluster that has vnodes and consists of hundreds of
> physical nodes.
> Reporter: Tupshin Harper
> Assignee: Jonathan Ellis
> Attachments: 6000vnodes.patch, AdjustableGossipPeriod.patch,
> delayEstimatorUntilStatisticallyValid.patch
>
>
> There are a lot of gossip-related issues related to very wide clusters that
> also have vnodes enabled. Let's use this ticket as a master in case there are
> sub-tickets.
> The most obvious symptom I've seen is with 1000 nodes in EC2 with m1.xlarge
> instances. Each node configured with 32 vnodes.
> Without vnodes, cluster spins up fine and is ready to handle requests within
> 30 minutes or less.
> With vnodes, nodes are reporting constant up/down flapping messages with no
> external load on the cluster. After a couple of hours, they were still
> flapping, had very high cpu load, and the cluster never looked like it was
> going to stabilize or be useful for traffic.
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