On 12/13/2016 8:38 AM, Zheng Lin Edwin Yeo wrote: > Is it possible to rename a collection without using a collection API? > I could not find any rename action in the Collections API.
No. There is no rename functionality. The workaround is to use the alias feature, which Erick mentioned. Renaming a collection could be done with a significant amount of manual editing, both in the relevant nodes and in zookeeper. If you want to try this, I strongly recommend that you shut down the relevant Solr instances. As you can might imagine, it would be highly disruptive. > I read from here > http://stackoverflow.com/questions/34889307/how-can-i-rename-a-core-created-in-solr > that we can use action=RENAME That's on a *core*, not a *collection*. Using the core rename functionality while running SolrCloud will cause issues. It might be as simple as losing one shard replica, or it could completely break the collection. The CoreAdmin API still has the rename commmand in 6.3, but the Collections API has never had it. It is theoretically possible to implement it, but it would never execute in an atomic way, which is the main reason it has never been done. By atomic, I mean in a manner that results in the old collection handling requests up to the change, then the new collection handling the very next request. The rename would probably take a few seconds, during which both the old and the new collections might be nonfunctional. It would be nearly as disruptive as doing it manually. This is problematic for anything trying to query or update the collection. Collection aliases provide nearly equivalent functionality in SolrCloud to what's available in standalone mode with core renames. If you always use an alias, you have the option of changing an existing alias to point at a new real collection, or you can make a new alias and then delete the old one. Thanks, Shawn
