> I work on simple test that insert one million documents in a MongoDB
> collection.

> When the collection is not sharded, the test last 60 seconds.
> When the collection is sharded, the test last 140 seconds.

> For information purpose :

> The shard key is a random value : doc.__sd.shard =
> Math.round(Math.random() * 1000)
> I have 4 servers splited in 2 replicaset (one primary, one secondary and
> one arbiter)
> The test load balance the data to be inserted on the 4 mongos.

> Thank you for your help
> Romain

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> Le mardi 2 octobre 2012 17:17:44 UTC+2, Max Schireson a écrit :

>> For initial loads, you should pre-split. Otherwise initially all records
>> will go into one shard then have to be balanced into others. Pre-splitting
>> will allow the system to distrubute the data among the shards from the
>> beginning.

>> This shouldn't be an issue in ongoing operations. It is slightly better
>> in 2.2 than earlier but pre-splitting is still recommended for the initial
>> load - the balancing algorithms aren't designed to work with near-empty
>> systems.

>> -- Max
>> On Oct 2, 2012 7:57 AM, "Romain P" <fili...@gmail.com> wrote:

>>> Hi,

>>> I work on simple test that insert one million documents in a MongoDB
>>> collection.

>>> When the collection is not sharded, the test last 60 seconds.
>>> When the collection is sharded, the test last 140 seconds.

>>> For information purpose :

>>> The shard key is a random value : doc.__sd.shard =
>>> Math.round(Math.random() * 1000)
>>> I have 4 servers splited in 2 replicaset (one primary, one secondary and
>>> one arbiter)
>>> The test load balance the data to be inserted on the 4 mongos.

>>> Thank you for your help
>>> Romain

>>> --
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>>> Groups "mongodb-user" group.
>>> To post to this group, send email to mongod...@googlegroups.com
>>> To unsubscribe from this group, send email to
>>> mongodb-user...@**googlegroups.com
>>> See also the IRC channel -- freenode.net#mongodb

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