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From "Jonathan Ellis (JIRA)" <>
Subject [jira] Updated: (CASSANDRA-192) Load balancing
Date Thu, 18 Jun 2009 17:38:08 GMT


Jonathan Ellis updated CASSANDRA-192:

    Fix Version/s:     (was: 0.4)

> Load balancing
> --------------
>                 Key: CASSANDRA-192
>                 URL:
>             Project: Cassandra
>          Issue Type: New Feature
>            Reporter: Jonathan Ellis
>             Fix For: 0.5
> We need to be able to spread load evenly across a cluster to mitigate keys not being
uniformly distributed as well as heterogeneous nodes in a cluster.  The former is particularly
likely to be a problem when using the OrderPreservingPartitioner, since the keys are not randomized
by a hash function.
> Avinash suggested three papers on load balancing in this thread:
> Of these, the useful ones are
> (Simple Efficient Load Balancing
Algorithms for Peer-to-Peer Systems by David R. Karger and Matthias Ruhl)
> (Load Balancing in Structured
P2P Systems by Ananth Rao et al)
> The third, 
> (Simple Load Balancing
for Distributed Hash Tables by John Byers et al) is not applicable to Cassandra's design.
 ("First, we suggest the direct application of the 'power of two choices' paradigm, whereby
an item is stored at the less loaded of two (or more) random alternatives. We then consider
how associating a small constant number of hash values with a key can naturally be extended
to support other load balancing strategies.")

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