Re: Insert-only application repair

[Jeff Jirsa]

In a TTL only use case with no explicit deletes, if read CL + write CL > RF you 
can likely avoid repairs with a few huge caveats:

1) read repair may mess up your ttl expiration if you’re using TWCS
2) if you lose a host you probably need to run repairs or you may not see some 
data after replacement (true in general)

-- 
Jeff Jirsa


> On May 12, 2018, at 5:27 AM, onmstester onmstester  
> wrote:
> 
> Thank you Nitan,
> That's exactly my case (RF > CL). But as long as there is no node outage, 
> shouldn't the hinted handoff handle data consistency?
> 
> Sent using Zoho Mail
> 
> 
> 
>  On Sat, 12 May 2018 16:26:13 +0430 Nitan Kainth  
> wrote 
> 
> If you have RF>CL then Repair needs to be run to make sure data is in sync. 
> 
> Sent from my iPhone
> 
> On May 12, 2018, at 3:54 AM, onmstester onmstester  
> wrote:
> 
> 
> In an insert-only use case with TTL (6 months), should i run this command, 
> every 5-7 days on all the nodes of production cluster (according to this: 
> http://cassandra.apache.org/doc/latest/operating/repair.html )?
> nodetool repair -pr --full
> When none of the nodes was down in 4 months (ever since the cluster was 
> launched) and none of the rows been deleted, why should i run nodetool repair?
> 
> 

Re: Insert-only application repair

[onmstester onmstester]

Thank you Nitan,

That's exactly my case (RF  CL). But as long as there is no node outage, 
shouldn't the hinted handoff handle data consistency?


Sent using Zoho Mail






 On Sat, 12 May 2018 16:26:13 +0430 Nitan Kainth 
nitankai...@gmail.com wrote 




If you have RFCL then Repair needs to be run to make sure data is in sync. 



Sent from my iPhone



On May 12, 2018, at 3:54 AM, onmstester onmstester onmstes...@zoho.com 
wrote:







In an insert-only use case with TTL (6 months), should i run this command, 
every 5-7 days on all the nodes of production cluster (according to this: 
http://cassandra.apache.org/doc/latest/operating/repair.html )?

nodetool repair -pr --full

When none of the nodes was down in 4 months (ever since the cluster was 
launched) and none of the rows been deleted, why should i run nodetool repair?

Re: Insert-only application repair

[Nitan Kainth]

If you have RF>CL then Repair needs to be run to make sure data is in sync. 

Sent from my iPhone

> On May 12, 2018, at 3:54 AM, onmstester onmstester  
> wrote:
> 
> 
> In an insert-only use case with TTL (6 months), should i run this command, 
> every 5-7 days on all the nodes of production cluster (according to this: 
> http://cassandra.apache.org/doc/latest/operating/repair.html )?
> nodetool repair -pr --full
> When none of the nodes was down in 4 months (ever since the cluster was 
> launched) and none of the rows been deleted, why should i run nodetool repair?
> 

Insert-only application repair

[onmstester onmstester]

In an insert-only use case with TTL (6 months), should i run this command, 
every 5-7 days on all the nodes of production cluster (according to this: 
http://cassandra.apache.org/doc/latest/operating/repair.html )?

nodetool repair -pr --full

When none of the nodes was down in 4 months (ever since the cluster was 
launched) and none of the rows been deleted, why should i run nodetool repair?