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From Zhu Han <>
Subject Re: RFC: Cassandra Virtual Nodes
Date Thu, 22 Mar 2012 12:46:54 GMT
On Thu, Mar 22, 2012 at 6:20 PM, Richard Low <> wrote:

> On 22 March 2012 05:48, Zhu Han <> wrote:
> > I second it.
> >
> > Is there some goals we missed which can not be achieved by assigning
> > multiple tokens to a single node?
> This is exactly the proposed solution.  The discussion is about how to
> implement this, and the methods of choosing tokens and replication
> strategy.

Does the new scheme  still require the node to re-iterate all sstables to
build the merkle tree or streaming data for partition level
repair and move?

The disk IO triggered by above steps could be very time-consuming if the
dataset on single node is very large.  It could be much more costly than
the network IO, especially when concurrent repair tasks hit the same

Is there any good ideas on it?

> Richard.

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