There's no problem here, but I'm curious about how batches of updates are handled on the Solr server side in Solr cloud?
Going over the code for DistributedUpdateProcessor and SolrCmdDistributor, it appears that the batch is broken down and docs are processed one-by-one. By processed, I mean that each doc in the batch from the client is sent to replicas individually. This makes sense but I wonder if the forwarding on to replicas could be done in sub-batches? For instance, if the client sends a batch of 100 documents to a cluster with 4 shards, I wonder if it would be more efficient to calculate the shard assignments to create 4 sub-batches and then forward those 4 sub-batches on to their respective leaders? Maybe I'm overthinking it too ;-) Cheers, Tim
