cassandra-commits mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Chris Burroughs (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-6127) vnodes don't scale to hundreds of nodes
Date Fri, 25 Oct 2013 12:31:33 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-6127?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13805267#comment-13805267
] 

Chris Burroughs commented on CASSANDRA-6127:
--------------------------------------------

> It would be helpful to dump the interval times for a node that is flapping (dumpInterArrivalTimes
on the FD) so we can see how long the heartbeats are taking.

A per endpoint histogram of heartbeat arrival latency seems a worthwhile o.a.c.Metric to have
all the time.

[~qconner]  On the topic of "wait until there is enough data before doing stuff" you might
also be interested in the heuristic & report from CASSANDRA-4288

> 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.



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

Mime
View raw message