Which version of Solr are you using. See https://lucidworks.com/2015/06/10/indexing-performance-solr-5-2-now-twice-fast/
https://issues.apache.org/jira/browse/SOLR-7333 Also would suggest to index using SolrJ with parallelism (multiple threads and/or machines) to increase indexing thru-put further. On Tue, Jun 6, 2017 at 4:51 AM, Isart Montane <isart.mont...@gmail.com> wrote: > Hello, > > We are using SolrCloud with 5 nodes, 2 collections, 2 shards each. The > problem we are seeing is a huge drop on writes when the number of replicas > increase. > > When we index (using DIH and batches) a collection with no replicas, we are > able to index at 1800 inserts/sec. That number decreases to 1200 with 1 > replica, 800 with 2 replicas and 400 with 3 replicas and it keeps getting > worst when more replicas are added. > > We've been reading about it and it seems that the `replicationFactor` plays > a big role on that, but we've got it set to 1, so I'm not sure why it keeps > decreasing when more replicas are added. In fact, we don't need the data to > be replicated in real time (we can even afford minutes of delay), but I've > been unable to find how to tune that. > > Has anyone experienced a similar behaviour? is there any way to increase > the indexing performance when using SolrCloud? > > We've seen posts about people having +100 replicas, so my feeling is that > there's something to tune that we are not doing. > > Thanks > > > Isart Montane Mogas >
