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From Aleksandr Ivanov <ale...@gmail.com>
Subject Re: unreachable nodes mystery in describecluster output
Date Wed, 03 Aug 2016 14:05:04 GMT
No VPN involved and no limitations, which can affects internode
communication, on network level. I'm curious why "nodetool status" shows
that all is OK and no suspicious messages in log file is such problem
exists.
I'm looking for hints how to troubleshoot such problem or maybe anyone have
seen such situation and can give some recommendations how to solve it.


On Wed, Aug 3, 2016 at 4:39 PM Romain Hardouin <romainh_ml@yahoo.fr> wrote:

> That's a good news if describecluster shows the same version on each node.
> Try with a high timeout like 120 seconds to see if it works.
> Is there a VPN between DCs? Is there room for improvement at the network
> level? TCP tuning, etc. I'm not saying you won't have unreachable nodes but
> it's worth it if you can.
>
> Romain
>
> Le Mercredi 3 août 2016 15h02, Aleksandr Ivanov <alekiv@gmail.com> a
> écrit :
>
>
> The latency is high...
>
> It is but is it really causing the problem? Latency is high but constant
> and not higher than ~200ms.
>
> Regarding the ALTER, did you try to increase the timeout with "cqlsh
> --request-timeout=REQUEST_TIMEOUT"? Because the default is 10 seconds.
>
> I use 25sec timeout (--request-timeout 25)
>
> Apart the unreachable nodes, do you know if all nodes have the same schema
> version?
>
> "nodetool gossipinfo" shows same scheme version on all nodes.
>
> Best,
>
> Romain
>
>
>
>

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