cassandra-commits mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Quentin Conner (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-6127) vnodes don't scale to hundreds of nodes
Date Wed, 20 Nov 2013 15:21:37 GMT

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

Quentin Conner updated CASSANDRA-6127:
--------------------------------------

    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.



--
This message was sent by Atlassian JIRA
(v6.1#6144)

Mime
View raw message