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From Robert Coli <rc...@eventbrite.com>
Subject Re: Cassandra 1.2.9 cluster with vnodes is heavily unbalanced.
Date Fri, 20 Sep 2013 17:31:28 GMT
On Fri, Sep 20, 2013 at 9:24 AM, Jayadev Jayaraman <jdisalive@gmail.com>wrote:

> As a follow-up, is operating a Cassandra cluster with machines on multiple
> racks and vnodes bound to cause load imbalance ? Shouldn't token-ranges
> assigned to individual machines via their vnodes be approximately balanced
> ? We're otherwise unable to explain why this imbalance occurs. ( it
> shouldn't be the fault of the Murmur3 partitioner which guarantees a
> uniform distribution of keys across token-ranges according to the doc. )
>

https://issues.apache.org/jira/browse/CASSANDRA-4658
https://issues.apache.org/jira/browse/CASSANDRA-4123

tl;dr : Yes, vnodes makes the imbalance factor slightly greater, but in
practice it "shouldn't" be significant.

If you are experiencing significant imbalance, one or both of those tickets
may be an appropriate forum to describe your experience.

=Rob

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