Continuous HTTP POSTs to Riak

Christopher Mancini cmancini at basho.com
Thu Mar 3 21:25:52 EST 2016


If you don't need strong consistency for all Riak requests, just certain
ones, then explore the use of R and N vals that can be passed along with
the request or on a bucket-type level.

On Thu, Mar 3, 2016 at 9:23 PM Mark Schmidt <mschmidt at orcawave.net> wrote:

> Hi Qiang,
>
>
>
> Other more skilled folks can correct me if I am wrong, but I believe you
> can enforce strong consistency on your nodes:
> http://docs.basho.com/riak/latest/theory/concepts/strong-consistency/
>
>
>
> If I recall, you will take a performance hit as all nodes must receive the
> data.
>
>
>
> Thanks,
>
>
>
> -          Mark Schmidt
>
>
>
> *From:* riak-users [mailto:riak-users-bounces at lists.basho.com] *On Behalf
> Of *Qiang Cao
> *Sent:* Thursday, March 03, 2016 6:13 PM
> *To:* Dave King <djking at gmail.com>
> *Cc:* riak-users <riak-users at lists.basho.com>
> *Subject:* Re: Continuous HTTP POSTs to Riak
>
>
>
> Thanks, Dave! I'm aware of Riak's eventual consistency. I wonder how I can
> get Riak work in the way as I need. I'm in a situation where I expect the
> immediate GET reads the value I've just posted. And the GET request isn't
> sent out until the POST is done.
>
>
>
> Thanks,
>
> -Qiang
>
>
>
> On Thu, Mar 3, 2016 at 6:53 PM, Dave King <djking at gmail.com> wrote:
>
> You need to google 'Eventual consistency'.
>
>
>
> - Peace
>
> Dave
>
>
>
>
>
> On Thu, Mar 3, 2016 at 4:23 PM, Qiang Cao <caoqiang.cs at gmail.com> wrote:
>
> Hi All,
>
>
>
> I use Riak as a KV store and send http requests to its REST API to update
> entries. Instead of using curl, I use Apache HttpClient to send requests.
>
>
>
> One thing bothering me is that sometimes I find the entry isn't properly
> updated after an HTTP POST/PUT. For example, if I do an HTTP GET on the
> same key immediately after an HTTP POST, the chance is good that I get a
> stale value. This happens when I continuously POST to a multi-node Riak,
> and some of the posts target the same key.
>
>
>
> Also, I find I don't have this issue if I use a single-node Riak. So I
> think something wasn't correct with my multi-node Riak cluster (I set
> "allow_mult" to false).  Any thoughts?
>
>
>
> Thanks in advance!
>
>
>
> Qiang
>
>
>
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>
>
>
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-- 
Sincerely,

Christopher Mancini
-----------------------------

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