Hi Chris, The easiest approach is to just create a new core on the new machine that references the collection and shard you want to migrate. For example, say you split shard1 of a collection named "cloud", which results in having: shard1_0 and shard1_1. Now let's say you want to migrate shard 1_0 over to the new machine.
First, fire off a q=*:*&distrib=false query to the shard you're migrating so that you know how many docs it has (which will be used to verify the migration was clean below). Next, bring up the new machine in cloud mode (-zkHost=?) and then go to the admin console on that server. Nav to the core admin page and create a new core, specifying the collection and shard1_0 in the form; note: the form leads you to believe you need to create the directory on the local system but you actually don't need to worry about doing that as the config will get pulled from ZK and the directory will get created on the fly (at least that's what happened in my env using branch_4x). When the new core initializes, it will use good ol' snapshot replication to pull the index from the leader. Verify the new core is happy by executing the q=*:*&distrib=false query again. Once you're satisfied, you can unload the core you migrated. Btw ... you can do all this with the core admin API instead of the Web UI if you want to script it. Cheers, Timothy Potter Sr. Software Engineer, LucidWorks www.lucidworks.com ________________________________________ From: cwhi <chris.whi...@gmail.com> Sent: Sunday, December 15, 2013 3:43 PM To: solr-user@lucene.apache.org Subject: How can you move a shard from one SolrCloud node to another? Let's say I want to rebalance a SolrCloud collection. I call SPLITSHARD to split an existing shard, and then I'd like to move one of the subshards to a new machine so the index is more balanced. Can this be done? If not, how do you rebalance an existing SolrCloud collection? -- View this message in context: http://lucene.472066.n3.nabble.com/How-can-you-move-a-shard-from-one-SolrCloud-node-to-another-tp4106815.html Sent from the Solr - User mailing list archive at Nabble.com.
