Hi Peng,
Racks can be logical (as defined with RAC attribute in Cassandra configuration
files) or physical (racks in server rooms).
In my view, for leveraging racks in your case, its important to understand the
implication of following decisions:
1. Number of distinct logical RACs defined in
Note that if you use more racks than RF you lose some of the operational
benefit. e.g: you'll still only be able to take out one rack at a time
(especially if using vnodes), despite the fact that you have more racks
than RF. As Jeff said this may be desirable, but really it comes down to
what your
On 2017-07-26 19:38 (-0700), "Peng Xiao" <2535...@qq.com> wrote:
> Kurt/All,
>
>
> why the # of racks should be equal to RF?
>
> For example,we have 2 DCs each 6 machines with RF=3,each machine virtualized
> to 8 vms ,
> can we set 6 racs with RF3? I mean one machine one RAC to avoid
;;
: "Peng Xiao"<2535...@qq.com>;
: Re: ?? tolerate how many nodes down in the cluster
Hi Brooke,
Very nice presentation: https://www.youtube.com/watch?v=QrP7G1eeQTI !!
Good to know that you are able to leverage Racks for gaining operational
efficiencies. I t
mes when clusters need immediate
expansion, racks should be the last things to worry about.
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主题: 回复： 回复： tolerate how many nodes down in the cluster
One more question.why the # of racks should be eq
星期三) 上午10:32
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主题: 回复： 回复： tolerate how many nodes down in the cluster
Thanks for the remind,we will setup a new DC as suggested.
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主题: Re: 回复： tolerate how many nodes down in the cluster
Keep in mind that you shouldn't just enable multiple racks on an existing
cluster (this will lead to massive inconsistencies). The best method is to
migrate to a new DC as Brooke mentioned.
Keep in mind that you shouldn't just enable multiple racks on an existing
cluster (this will lead to massive inconsistencies). The best method is to
migrate to a new DC as Brooke mentioned.
"anujw_2...@yahoo.co.in"<anujw_2...@yahoo.co.in>;
: "Peng Xiao"<2535...@qq.com>;
: Re: ?? tolerate how many nodes down in the cluster
I've never really understood why Datastax recommends against racks. In those
docs they make it out to be much m
I've never really understood why Datastax recommends against racks. In
those docs they make it out to be much more difficult than it actually is
to configure and manage racks.
The important thing to keep in mind when using racks is that your # of
racks should be equal to your RF. If you have
veral node
> moves and has has to ensure to ensure that racks will be distributing data
> correctly and evenly. At times when clusters need immediate expansion,
> racks should be the last things to worry about.
>
>
>
>
>
> -- 原始邮件 --
> *发件人:* "Bhuvan Rawal&quo
---发件人: "Bhuvan
Rawal";<bhu1ra...@gmail.com>;发送时间: 2017年7月24日(星期一) 晚上7:17收件人:
"user"<user@cassandra.apache.org>; 主题: Re: tolerate how many nodes down in the
cluster
Hi Peng ,
This really depends on how you have configured your topology. Say if you have
segregated you
huvan Rawal";<bhu1ra...@gmail.com>;
发送时间: 2017年7月24日(星期一) 晚上7:17
收件人: "user"<user@cassandra.apache.org>;
主题: Re: tolerate how many nodes down in the cluster
Hi Peng ,
This really depends on how you have configured your topology. Say if you have
segregated your dc i
Hi Peng ,
This really depends on how you have configured your topology. Say if you
have segregated your dc into 3 racks with 10 servers each. With RF of 3 you
can safely assume your data to be available if one rack goes down.
But if different servers amongst the racks fail then i guess you are
Hi,
Suppose we have a 30 nodes cluster in one DC with RF=3,
how many nodes can be down?can we tolerate 10 nodes down?
it seems that we are not able to avoid the data distribution 3 replicas in the
10 nodes?,
then we can only tolerate 1 node down even we have 30 nodes?
Could anyone please
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