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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-6127) vnodes don't scale to hundreds of nodes
Date Tue, 12 Nov 2013 23:45:19 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-6127?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13820669#comment-13820669
] 

Jonathan Ellis commented on CASSANDRA-6127:
-------------------------------------------

bq. ISTM that FD processing Gossip updates synchronously is a fundamental problem. Any hiccup
in processing will cause FD false positives.

I've pulled a fix for this out to CASSANDRA-6338.

> 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
>
>
> 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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