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From Brett Hoerner <>
Subject Re: Problems with maxShardsPerNode in 4.5
Date Wed, 02 Oct 2013 01:55:31 GMT
Related, 1 more try:

Created collection starting with 4 shards on 1 box. Had to set
maxShardsPerNode to 4 to do this.

Now I want to "roll over" my time window, so to attempt to deal with the
problems noted above I delete the oldest shard first. That works fine.

Now I try to add my new shard, which works, but again it defaults to
"maxShardsPerNode" # of replicas, so I'm left with:

* [deleted by me] hour0
* hour1 - 1 replica
* hour2 - 1 replica
* hour3 - 1 replica
* hour4 - 4 replicas [ << the one I created after deleting hour0]

Still at a loss as to how I would create 1 new shard with 1 replica on any
server in 4.5?


On Tue, Oct 1, 2013 at 8:14 PM, Brett Hoerner <>wrote:

> It seems that changes in 4.5 collection configuration now require users to
> set a maxShardsPerNode (or it defaults to 1).
> Maybe this was the case before, but with the new CREATESHARD API it seems
> a very restrictive. I've just created a very simple test collection on 3
> machines where I set maxShardsPerNode at collection creation time to 1, and
> I made 3 shards. Everything is good.
> Now I want a 4th shard, it seems impossible to create because the cluster
> "knows" I should only have 1 shard per node. Yet my problem doesn't require
> more hardware, I just my new shard to exist on one of the existing servers.
> So I try again -- I create a collection with 3 shards and set
> maxShardsPerNode to 1000 (just as a silly test). Everything is good.
> Now I add shard4 and it immediately tries to add 1000 replicas of shard4...
> You can see my earlier email today about time-oriented data in 4.5 to see
> what I'm trying to do. I was hoping to have 1 shard per hour/day with the
> ability to easily add/drop them as I move the time window (say, a week of
> data, 1 per day).
> Am I missing something?
> Thanks!

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