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From "Jonathan Ellis (JIRA)" <>
Subject [jira] Reopened: (CASSANDRA-1569) New variant of NetworkTopologyStrategy to eliminate hotspots
Date Mon, 04 Oct 2010 01:51:33 GMT


Jonathan Ellis reopened CASSANDRA-1569:

oops, didn't mean to Resolve w/ last comment.

... separate logical rings per DC is how NTS worked until r954657.  So that looks like a regression
to me.

> New variant of NetworkTopologyStrategy to eliminate hotspots
> ------------------------------------------------------------
>                 Key: CASSANDRA-1569
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Stu Hood
>            Assignee: Stu Hood
>             Fix For: 0.7.0
> NetworkTopologyStrategy assigns replicas to the first endpoints encountered in the required
DCs during a ring-order walk. This will lead to hotspots if you don't have an equal number
of nodes in each DC, and if you don't alternate them in the ring.
> An alternate algorithm that prevents hotspots is to choose replicas using fractions.
If the first replica is on the 4th node of 10 for a particular DC, its fractional position
is 0.4: remaining replicas in other DCs will be placed on the node at that fractional position.

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