On Thu, Oct 20, 2016 at 5:38 PM, Rallavagu <rallav...@gmail.com> wrote: > Solr 5.4.1 cloud with embedded jetty > > Looking for some ideas around offline indexing where an independent node > will be indexed offline (not in the cloud) and added to the cloud to become > leader so other cloud nodes will get replicated. Wonder if this is possible > without interrupting the live service. Thanks.
How we do this, to reindex collection "foo": 1) First, collection "foo" should be an alias to the real collection, eg "foo_1" aliased to "foo" 2) Have a node "node_i" in the cluster that is used for indexing. It doesn't hold any shards of any collections 3) Use collections API to create collection "foo_2", with however many shards required, but all placed on "node_i" 4) Index "foo_2" with new data with DIH or direct indexing to "node_1". 5) Use collections API to expand "foo_2" to all the nodes/replicas that it should be on 6) Remove "foo_2" from "node_i" 7) Verify contents of "foo_2" are correct 8) Use collections API to change alias for "foo" to "foo_2" 9) Remove "foo_1" collection once happy This avoids indexing overwhelming the performance of the cluster (or any nodes in the cluster that receive queries), and can be performed with zero downtime or config changes on the clients. Cheers Tom
