dsmiley commented on issue #1366: SOLR-14342: Optimize core loading order in SolrCloud. URL: https://github.com/apache/lucene-solr/pull/1366#issuecomment-603492062 I'll commit in two days according to lazy concensus if there's no further input. The original issue was filed as a bug fix with a CHANGES.txt entry: "In cloud-mode sort the cores smartly before loading & limit threads to improve cluster stability". There were aspects to the original other than core load order -- namely limiting the number of threads that load cores at once from 24 to 8. I don't really think of core load order as a bug fix even if it helps with stability because this is a best-effort sort of thing. It's an improvement (perhaps optimization). AFAICT users would see this during cross-cluster simultaneous node startup but also to a degree even the local node since some collections should come online quickly if there isn't agreement needed on other nodes. Proposed CHANGES entry: Improvement: * Load cores in an order that makes collections available sooner and reduces leaderVoteWait timeouts in large SolrCloud clusters.
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