-DCassandra.join_ring=false;

[Yang <te...@gmail.com>]

CASSANDRA-526 provides this ability,  I just want to make sure,

let's say I have one node, with token 0, and now I want to add 2 new
ones, with initial_token set at 1/3 and 2/3 of the full range.

now I start nodes 2 and 3 with the -DCassandra.join_ring=false option,
and later use JMX joinRing() to let 2 and 3 join.

if there is a slight lag between the time 2 and 3 talk to 1, would it
be possible that 2/3 of the keyspace is shipped out to node 2, and
then when node 3 joins, it's shuffled out to node 3 again
(unnecessarily) ?  basically I want everyone to come together, agree
on
the current global membership, then start carving out the existing load.


Thanks
Yang

Re: -DCassandra.join_ring=false;

[aaron morton <aa...@thelastpickle.com>]

If you have node 1 with token 0 and a total token range to 10 then…

* add node 2 with token 3 and it will only take ownership of the range 0 to 3. Node 1 will own 3 to 0
* add node 3 with token 6 and it will take ownership of the range 3 to 6.  Node 1 will now own 6 to 0

Unless you have an urgent need I would one node at a time and let the bootstrap finish.

Cheers

-----------------
Aaron Morton
Freelance Cassandra Developer
@aaronmorton
http://www.thelastpickle.com

On 21/09/2011, at 6:38 PM, Yang wrote:

> CASSANDRA-526 provides this ability,  I just want to make sure,
> 
> let's say I have one node, with token 0, and now I want to add 2 new
> ones, with initial_token set at 1/3 and 2/3 of the full range.
> 
> now I start nodes 2 and 3 with the -DCassandra.join_ring=false option,
> and later use JMX joinRing() to let 2 and 3 join.
> 
> if there is a slight lag between the time 2 and 3 talk to 1, would it
> be possible that 2/3 of the keyspace is shipped out to node 2, and
> then when node 3 joins, it's shuffled out to node 3 again
> (unnecessarily) ?  basically I want everyone to come together, agree
> on
> the current global membership, then start carving out the existing load.
> 
> 
> Thanks
> Yang