Hi,   It's been a while ! If I remember correctly, we did not find any solution back then (with CDH5.3.0) - at least other than recreating the collection and re-indexing the data.   But after upgrading the CDH version using a version of Solr supporting the "ADDREPLICA" and "DELETEREPLICA" functions in the API you can add an other replica and then delete the one which is down.   regards, mathieu     ... View more

Hi Chris,   I tried your suggestions... and various alternatives: [zk: localhost:2181(CONNECTED) 8] ls / [configs, solr,n1:2181, zookeeper, solr.xml, solr,n1.hdc:2181, solr] [zk: localhost:2181(CONNECTED) 9] ls /solr [clusterstate.json, aliases.json, solr.xml, live_nodes, overseer, collections, overseer_elect] [zk: localhost:2181(CONNECTED) 10] ls /solr/collections [] [zk: localhost:2181(CONNECTED) 11] ls /solr,n1:2181 [solr] [zk: localhost:2181(CONNECTED) 12] ls /solr,n1:2181/solr [configs] [zk: localhost:2181(CONNECTED) 13] ls /solr,n1:2181/solr/configs [collection4] [zk: localhost:2181(CONNECTED) 14] ls /solr,n1.hdc:2181/solr [configs] [zk: localhost:2181(CONNECTED) 15] ls /solr,n1.hdc:2181/solr/configs [collection2, collection1] [zk: localhost:2181(CONNECTED) 16] Btw, my nodes are all in the domain hdc.  ... View more