On 7/20/2018 12:09 AM, Arunan Sugunakumar wrote: > I would like to know whether it is possible to create a collection in Solr > through SolrJ. I tried to create and it throws me an error saying that > "Solr instance is not running in SolrCloud mode.
A "collection" is a SolrCloud concept. Collections are comprised of one or more shards. Shards are comprised of one or more replicas. Each shard replica is a Solr index core. The Collections API, which is most likely what you are calling in SolrJ when you get that error, only works in SolrCloud mode. Standalone mode only has cores. They are not called collections. You can use the CoreAdmin API in standalone mode, but be aware of the large warning box here titled "CREATE must be able to find a configuration": https://lucene.apache.org/solr/guide/7_4/coreadmin-api.html Typically, filesystem access is required to create the configuration when running in standalone mode, before the core can be created. If you want to be able to create indexes completely remotely, that is a whole lot easier if Solr is running in SolrCloud mode. Something that the documentation for the CoreAdmin API doesn't say, but probably should, is that in most usage, instanceDir and dataDir should not be specified. The instanceDir will default to the same name as the core, and it will live in the solr home. The dataDir defaults to "./data" relative to the instanceDir, and this is usually the best option. Changing these is an expert option. Thanks, Shawn
