last_write_wins

Edgar Veiga edgarmveiga at gmail.com
Wed Jan 29 05:29:05 EST 2014


Hi Russel,

No, it doesn't depend. It's always a new value.

Best regards


On 29 January 2014 10:10, Russell Brown <russell.brown at me.com> wrote:

>
> On 29 Jan 2014, at 09:57, Edgar Veiga <edgarmveiga at gmail.com> wrote:
>
> tl;dr
>
> If I guarantee that the same key is only written with a 5 second interval,
> is last_write_wins=true profitable?
>
>
> It depends. Does the value you write depend in anyway on the value you
> read, or is it always that you are just getting a totally new value that
> replaces what is in Riak (regardless what is in Riak)?
>
>
>
> On 27 January 2014 23:25, Edgar Veiga <edgarmveiga at gmail.com> wrote:
>
>> Hi there everyone!
>>
>> I would like to know, if my current application is a good use case to set
>> last_write_wins to true.
>>
>> Basically I have a cluster of node.js workers reading and writing to
>> riak. Each node.js worker is responsible for a set of keys, so I can
>> guarantee some kind of non distributed cache...
>> The real deal here is that the writing operation is not run evertime an
>> object is changed but each 5 seconds in a "batch insertion/update" style.
>> This brings the guarantee that the same object cannot be write to riak at
>> the same time, not event at the same seconds, there's always a 5 second
>> window between each insertion/update.
>>
>> That said, is it profitable to me if I set last_write_wins to true? I've
>> been facing some massive writting delays under high loads and it would be
>> nice if I have some kind of way to tune riak.
>>
>> Thanks a lot and keep up the good work!
>>
>>
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