[SOLR-5958] Document (and fix) numShards and router selection parameter in SolrCloud

• Type: Improvement
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Component/s: documentation, SolrCloud
• Assignee: Anshum Gupta
• Reporter: Anshum Gupta
• Created: 04/Apr/14 02:33
• Updated: 19/Jun/17 22:16

Description

Right now numShards works in rather mysterious ways (unless you know how it works). We should clearly document the following:

• If we start SolrCloud with bootstrapping, without mentioning numShards parameter, it defaults to 1 and also defaults the router to 'implicit'.
• Mentioning numShards param, defaults the router to compositeId.
• Though the bootstrap does not treat numShards as a required param, the Collection API does and throw an error if we don't specify numShards.