Hi Erick and Shawn, Thanks for the response and information.
Regards, Edwin On 14 December 2016 at 00:53, Shawn Heisey <apa...@elyograg.org> wrote: > 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 > >
