On 8/23/2016 2:01 PM, Ronald Wood wrote: > In general, is there a way to migrate existing indexes (we have petabytes of > data) by enabling docvalues and incrementally re-indexing? We expect the > latter would take a month using an atomic update process.
One way to handle it is to build a new index with an updated configuration, then switch to the new index. Since you're not running SolrCloud, you can switch by swapping the cores. If you were running SolrCloud, you'd need to alias the old name to the new collection, which might involve deleting the old collection first. Swapping cores in cloud mode will break things. The other replies you've gotten are interesting. The approach using Atomic Updates will only work if your index meets the requirements for Atomic Updates. https://wiki.apache.org/solr/Atomic_Updates#Caveats_and_Limitations You've already said it would take a month using atomic update ... which might mean you've already thought about whether or not your index meets the requirements. Toke's tool looks quite interesting, and would probably do the job a lot faster than any other method. Thanks, Shawn
