[ https://issues.apache.org/jira/browse/SOLR-8531?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jeff Wartes closed SOLR-8531. ----------------------------- > ZK leader path changed in 5.4 > ----------------------------- > > Key: SOLR-8531 > URL: https://issues.apache.org/jira/browse/SOLR-8531 > Project: Solr > Issue Type: Bug > Components: SolrCloud > Affects Versions: 5.4 > Reporter: Jeff Wartes > Fix For: 5.4.1 > > > While doing a rolling upgrade from 5.3 to 5.4 of a solrcloud cluster, I > observed that upgraded nodes would not register their shards as active unless > they were elected the leader for the shard. > There were no errors, the shards were fully up and responsive, but would not > publish any change from the "down" state. > This appears to be because the recovery process never happens, because the ZK > node containing the current leader can't be found, because the ZK path has > changed. > Specifically, the leader data node changed from: > <collection>/leaders/<shard> > to > <collection>/leaders/<shard>/leader > It looks to me like this happened during SOLR-7844, perhaps accidentally. > At the least, the "Migrating to Solr 5.4" section of the README should get > updated with this info, since it means a rolling upgrade of a collection with > multiple replicas will suffer serious degradation in the number of active > replicas as nodes are upgraded. It's entirely possible this will reduce some > shards to a single active replica. -- This message was sent by Atlassian JIRA (v6.3.4#6332) --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org For additional commands, e-mail: dev-h...@lucene.apache.org