[jira] [Resolved] (CASSANDRA-6127) vnodes don't scale to hundreds of nodes

["Jonathan Ellis (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-6127?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jonathan Ellis resolved CASSANDRA-6127.
---------------------------------------

       Resolution: Fixed
    Reproduced In: 1.2.9, 1.2.6  (was: 1.2.6, 1.2.9)

I think we've addressed the major problems in the related tickets above.  No single culprit.

> 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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