Hello,
I have a question from a colleague who's managing a 3-node(VMs) SolrCloud cluster with a separate 3-node Zookeeper ensemble. Periodically the data center underneath the SolrCloud decides to upgrade the SolrCloud instance infrastructure in a "rolling upgrade" fashion. So after the 1st instance of the SolrCloud is shut down and while it is in the process of rebooting, the 2nd instance starts to shut down and so on. Eventually all three Solr instances are rebooted and up and running but the cluster in now inoperable. Meaning clients can't query or ingest data. My colleague is trying to ascertain if this problem is due to Solr's inability to recover from a rapid succession of reboots of the nodes or from the data center upgrade that is triggering a "situation" making SolrCloud inoperable. My question is, can a SolrCloud cluster become inoperable after its nodes are rebooted in rapid succession as described above? Is there an edge case similar to this? Thanks, Nazik Huq
