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Posted to user@cassandra.apache.org by Sungju Hong <eq...@gmail.com> on 2016/12/06 02:13:20 UTC

Ring show high load average when restarting a node.

Hello,

when I restart a node, other(most) nodes show high load average and block
queries for one or two minutes.
why other nodes are affected ?

- I have a cluster of 70 nodes.
- Cassandra version 1.2.3
- RF: 3
- disabled hinted handoff

I will appreciate any advice.

Thanks.
Regards.

Re: Ring show high load average when restarting a node.

Posted by Colin Kuo <co...@gmail.com>.

Hi,

The feature of speculative execution in Cassandra 2.0 helps in this case.
You can get further explanation on below link.
http://www.datastax.com/dev/blog/rapid-read-protection-in-cassandra-2-0-2

Thanks!

On Tue, Dec 6, 2016 at 10:13 AM, Sungju Hong <eq...@gmail.com> wrote:

> Hello,
>
> when I restart a node, other(most) nodes show high load average and block
> queries for one or two minutes.
> why other nodes are affected ?
>
> - I have a cluster of 70 nodes.
> - Cassandra version 1.2.3
> - RF: 3
> - disabled hinted handoff
>
> I will appreciate any advice.
>
> Thanks.
> Regards.
>
>
>