Hi Teddie, Take a look at the core.properties file on the cloned or clone. I suspect there's info in it that describes which collection and shard that node is responsible for. Zookeeper maintains a mapping of node addresses to cores and you can lock a node out of the cluster if you're not careful.
This used to be a common mistake with naive autoscaling where a "new" node would spin up with the same IP as an old node before the old one was properly removed from the cluster. Solr 7 has better autoscaling capabilities now: https://lucene.apache.org/solr/guide/7_6/solrcloud-autoscaling-overview.html k/r, Scott On Mon, Jan 28, 2019 at 1:44 AM teddie_lee <leeti...@outlook.com> wrote: > Hi, > > I have a SolrCloud cluster with 3 nodes running on AWS. My collection is > created with numShard=1and replicationFactor=3. Recently, due to the need > of > having stress test, our ops cloned a new machine with exactly the same > configuration as one of the nodes in existed cluster (let's say the new > machine is node4 and the node being cloned is node1). > > > However, after I started node4 mistakenly (node4 is supposed to start in > standalone mode, I just forgot to remove the configuration regards to > zookeeper), I could see that node4 took the place of node1 in Admin UI. > Then > I found directory 'items_shard1_replica_n1' under path > '../solr/server/solr/' is no longer exist on node1. Instead, the directory > was copied to node4. > > > I tried to stop Solr on node4 and restarted Solr on node1 but to no avail. > It seems like node1 can't rejoin the cluster automatically. Then I found > even I start Solr on node4, the status of node4 was still 'Down' and never > become 'Recovering' while the rest of the nodes in cluster are 'Active'. > > So the final solution is to copied directory 'items_shard1_replica_n1' > from > node4 back to the node1 and restarted Solr on node1. Then node1 join the > cluster automatically and everything seems fine. > > > My question is why this would happen? Or are there any documents about how > SolrCloud manages the cluster behind the scenes? > > > Thanks, > Teddie > > > > > -- > Sent from: http://lucene.472066.n3.nabble.com/Solr-User-f472068.html > -- Scott Stults | Founder & Solutions Architect | OpenSource Connections, LLC | 434.409.2780 http://www.opensourceconnections.com
