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https://issues.apache.org/jira/browse/CASSANDRA-6127?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Quentin Conner updated CASSANDRA-6127:
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Attachment: vnodes & gossip flaps.png
early results of testing with patch #3 were good
> 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: 2013-11-05_18-04-03_no_compression_cpu_time.png,
> 2013-11-05_18-09-38_compression_on_cpu_time.png, 6000vnodes.patch,
> AdjustableGossipPeriod.patch, cpu-vs-token-graph.png,
> delayEstimatorUntilStatisticallyValid.patch, flaps-vs-tokens.png, vnodes &
> gossip flaps.png
>
>
> 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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