Hi Shawn, Thanks for your reply.
The Zookeeper is running in standalone mode and it is on the same server on which the Solr is deployed. The IP address of the server is not changing. ZK_HOST = "localhost:2181" The clusterstate.json file is empty. Thanks, Modassar On Thu, Jan 20, 2022 at 4:53 AM Shawn Heisey <apa...@elyograg.org> wrote: > On 1/19/22 3:31 AM, Modassar Ather wrote: > > It creates the collection and the cores but as soon as the server is > > rebooted and Solr nodes are restarted the cores get deleted. > > The state.json file of the collection shows all the cores entry but the > > state of the cores as down. > > When Solr in cloud mode connects to a zookeeper that is empty, it will > delete all cores that it has locally, because none of them will be in > the ZK database. I filed a bug about this, but it is still open. It is > possible that when that node reboots, it is not connecting to the same > identical ZK host definition that it was connected to before the reboot, > so it is not seeing the ZK database that it was using before. If that's > happening, I do not know enough about your environment to guess why. > > https://issues.apache.org/jira/browse/SOLR-13396 > > Or maybe on reboot, the Solr instance is getting a different IP address > than it had before the reboot, so when it registers itself in the ZK > database, it no longer sees its own cores in the collection's > state.json, and deletes them. That would probably be more likely if you > have Solr deployed in containers rather than physical machines. If that > is happening, the solution would be to override the host definition that > SolrCloud is using so it's a name rather than an IP address. > > Thanks, > Shawn > >
