Hi Jonathan,

If you want to repair just one node (for example if it has been down for more 
than 3h), run “nodetool repair -full” on that node. This will bring all data on 
that node up to date.

If you want to repair all data on the cluster, run “nodetool repair -full -pr” 
on each node. This will run full repair on all nodes but it will do it so only 
the primary range for each node is fixed. If you do it on all nodes, 
effectively the whole token range is repaired. You can run the same without -pr 
to get the same effect but it’s not efficient because then you are doing the 
repair RF times on all data instead of just repairing the whole data once.

I hope this clarifies,
Hannu

> On 17 Mar 2018, at 17:20, Jonathan Baynes <jonathan.bay...@tradeweb.com> 
> wrote:
> 
> Hi Community,
>  
> Can someone confirm, as the documentation out on the web is so contradictory 
> and vague.
>  
> Nodetool repair –full if I call this, do I need to run this on ALL my nodes 
> or is just the once sufficient?
>  
> Thanks
> J
>  
> Jonathan Baynes
> DBA
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