Thanks for reporting this Brett. This is indeed a bug. A workaround is to specify replicationFactor=1 with the createShard command which will create only one replica even if maxShardsPerNode=1000 at collection level.
I'll open an issue. On Wed, Oct 2, 2013 at 7:25 AM, Brett Hoerner <br...@bretthoerner.com>wrote: > 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? > > Thanks! > > > On Tue, Oct 1, 2013 at 8:14 PM, Brett Hoerner <br...@bretthoerner.com > >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! > > > -- Regards, Shalin Shekhar Mangar.
