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From Viswanathan Ramachandran <vish.ramachand...@gmail.com>
Subject Re: Nodetool Repair questions
Date Tue, 12 Aug 2014 23:46:43 GMT
Andrey, QUORUM consistency and no deletes makes perfect sense.
I believe we could modify that to EACH_QUORUM or QUORUM consistency and no
deletes - isnt that right ?

Thanks


On Tue, Aug 12, 2014 at 3:10 PM, Andrey Ilinykh <ailinykh@gmail.com> wrote:

> 1. You don't have to repair if you use QUORUM consistency and you don't
> delete data.
> 2.Performance depends on size of data each node has. It's very difficult
> to predict. It may take days.
>
> Thank you,
>   Andrey
>
>
>
> On Tue, Aug 12, 2014 at 2:06 PM, Viswanathan Ramachandran <
> vish.ramachandran@gmail.com> wrote:
>
>> Some questions on nodetool repair.
>>
>> 1. This tool repairs inconsistencies across replicas of the row. Since
>> latest update always wins, I dont see inconsistencies other than ones
>> resulting from the combination of deletes, tombstones, and crashed nodes.
>> Technically, if data is never deleted from cassandra, then nodetool repair
>> does not need to be run at all. Is this understanding correct? If wrong,
>> can anyone provide other ways inconsistencies could occur?
>>
>> 2. Want to understand the performance of 'nodetool repair' in a Cassandra
>> multi data center setup. As we add nodes to the cluster in various data
>> centers, does the performance of nodetool repair on each node increase
>> linearly, or is it quadratic ? The essence of this question is: If I have a
>> keyspace with x number of replicas in each data center, do I have to deal
>> with an upper limit on the number of data centers/nodes?
>>
>>
>> Thanks
>>
>> Vish
>>
>
>

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