How long will all nodes data sync.

["Vincent Lu (ECL)" <vi...@cyberlink.com>]

Hi all,

 

I have a question about eventually consistency.

If there are 3 nodes and RF=3, Write-C=Quorum.

How long will all 3 nodes data sync?

Does any configuration can change that?

Thanks in advance.

 

Vincent

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Re: How long will all nodes data sync.

[mcasandra <mo...@gmail.com>]

Is there a way to monitor how far behind the sync is? In case of hinted hand
off or when node is down for extended period of time it will probably be
helpful to know.

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Re: How long will all nodes data sync.

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

The answer is eventually. There is no point in time. 

The simple case where your 3 nodes are up, and not under pressure, your write will  end up at every replica. 

Hope that helps . 
Aaron
On 11 Mar 2011, at 16:38, Vincent Lu (ECL) wrote:

> Hi all,
>  
> I have a question about eventually consistency.
> If there are 3 nodes and RF=3, Write-C=Quorum.
> How long will all 3 nodes data sync?
> Does any configuration can change that?
> Thanks in advance.
>  
> Vincent
> This correspondence is from Cyberlink Corp. and is intended only for use by the recipient named herein, and may contain privileged, proprietary and/or confidential information, and is intended only to be seen and used by named addressee(s). You are notified that any discussion, dissemination, distribution or copying of this correspondence and any attachments, is strictly prohibited, unless otherwise authorized or consented to in writing by the sender. If you have received this correspondence in error, please notify the sender immediately, and please permanently delete the original and any copies of it and any attachment and destroy any related printouts without reading or copying them.

Re: How long will all nodes data sync.

[mcasandra <mo...@gmail.com>]

Yes I understand that piece but my thought is that if node is down and came
up but at that point we want to know how long the sync will take in case
there were another node to fail in the replica set. It also is good data
point to see how long it takes to sync.

It's always good to have this data handy and is always useful when in
production, in my opinion.

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Re: How long will all nodes data sync.

[Jonathan Ellis <jb...@gmail.com>]

If you're using ConsistencyLevel appropriately then it doesn't matter,
because you're guaranteed to see data as current as you need.

On Thu, Mar 10, 2011 at 9:38 PM, Vincent Lu (ECL)
<vi...@cyberlink.com> wrote:
> Hi all,
>
>
>
> I have a question about eventually consistency.
>
> If there are 3 nodes and RF=3, Write-C=Quorum.
>
> How long will all 3 nodes data sync?
>
> Does any configuration can change that?
>
> Thanks in advance.
>
>
>
> Vincent
>
> This correspondence is from Cyberlink Corp. and is intended only for use by
> the recipient named herein, and may contain privileged, proprietary and/or
> confidential information, and is intended only to be seen and used by named
> addressee(s). You are notified that any discussion, dissemination,
> distribution or copying of this correspondence and any attachments, is
> strictly prohibited, unless otherwise authorized or consented to in writing
> by the sender. If you have received this correspondence in error, please
> notify the sender immediately, and please permanently delete the original
> and any copies of it and any attachment and destroy any related printouts
> without reading or copying them.



-- 
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of DataStax, the source for professional Cassandra support
http://www.datastax.com