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From Robin Verlangen <ro...@us2.nl>
Subject Re: Adding New Nodes to a Production Cluster
Date Wed, 27 Jun 2012 21:44:49 GMT
Hi Eran,

As far as I'm aware of a node will not serve requests until the bootstrap
(starts automatically these days) has been completed. So the problem of #1
is not really there Solution #2 is not straight forward and easy to make
mistakes.

When you're concerned about read consistency use a proper consistency
level, like QUORUM or LOCAL_QUORUM.

Cheers!

2012/6/27 Eran Chinthaka Withana <eran.chinthaka@gmail.com>

> Hi,
>
> We have a production cluster with few nodes in each data center. Each node
> is being contacted in each data center to serve front end requests. I have
> a question about the method adding new nodes to the cluster (say, to
> improve RF or scalability). AFAIK, there are two methods to do this.
>
> 1. Bring up the node, with no data in it, and let it get the data from the
> peers. But the issue with this problem is all the requests coming into this
> node can not be served until it gets all the data. This is a big impact for
> front end.
> 2. Copy all the data into the new node from other nodes (we can be little
> bit smart here selecting which nodes to copy from), bring it up and run
> cleanup and repair. The issue with this approach is all the data will be
> around 1TB and it will take a consider amount of time to copy them all and
> also because of the rate of updates happening its sometimes hard to shadow
> the time to copy the data in to this node.
>
> Is there an option in Cassandra, where I can bring a node up, just like in
> #1, but ask peers not to send any read request to it? Or may be apart from
> all these, are there better option to handle new nodes?
>
> Also, I think I can use a similar method when a node goes down (say, disk
> or RAID failure) for a longer period of time.
>
> Please help me to find an answer to this.
>
> Thanks,
> Eran Chinthaka Withana
>



-- 
With kind regards,

Robin Verlangen
*Software engineer*
*
*
W http://www.robinverlangen.nl
E robin@us2.nl

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