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Message from discussion distributing storage?
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project2501  
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 More options Dec 1 2011, 10:26 am
From: project2501 <darreng5...@gmail.com>
Date: Thu, 1 Dec 2011 07:26:08 -0800 (PST)
Local: Thurs, Dec 1 2011 10:26 am
Subject: Re: distributing storage?
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Hi,
  Thanks for the tip. If they are randomly inserted into shards, and
evenly distributed.
Then at query time, the id's are returned with no additional penalty,
yes? Because
all the shards got the query.

Is it then possible to know what shard the result id came from and
retrieve it from only that shard?

thanks.

On Dec 1, 10:22 am, Sergei Tulentsev <sergei.tulent...@gmail.com>
wrote:

> If you're updating a document, this write will go to its shard. If you're
> inserting a new document, it will go to a shard where its chunk lives. If
> you want random distribution of new documents, use random shard key, like
> md5 of something.
> But there are some serious drawbacks in this approach. For example, a
> simple retrieval by _id will go to all shard (unless you specify shard key,
> which you will have to calculate again).

> On Thu, Dec 1, 2011 at 7:06 PM, project2501 <darreng5...@gmail.com> wrote:
> > Hi,
> >  I know about mongodb's auto-scaling/sharding and that it is
> > triggered by storage limits in size.
> > But can I distribute my document writes evenly across a cluster? In
> > other words, I want mongos to do something like a round-robin or some
> > other algorithm to distribute writes across the cluster as they
> > arrive.

> > Is it possible?

> > thanks.

> > --
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> --
> Best regards,
> Sergei Tulentsev


 
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