On my local machine I have the following test setup: * 2 "nodes" (JVMs) * 1 collection named "testdrive", that was originally created with numShards=1 and maxShardsPerNode=1. * After a series of SPLITSHARD commands, I now have 4 shards, as follows:
testdrive_shard1_0_0_replica1 (L) Active 115 testdrive_shard1_0_1_replica1 (L) Active 0 testdrive_shard1_1_0_replica1 (L) Active 5 testdrive_shard1_1_1_replica1 (L) Active 88 The number in the last column is the number of documents. The 4 shards are all on the same node; the second node holds nothing for this collection. Already, this situation is a little strange because I have 4 shards on one node, despite the fact that maxShardsPerNode is 1. My guess is that SPLITSHARD ignores the maxShardsPerNode value - is that right? Now, if I issue an ADDREPLICA command with collection=testdrive&shard=shard1_0_0, I get the following error: "Cannot create shards testdrive. Value of maxShardsPerNode is 1, and the number of live nodes is 2. This allows a maximum of 2 to be created. Value of numShards is 4 and value of replicationFactor is 1. This requires 4 shards to be created (higher than the allowed number)" I don't totally understand this.
