I have a mixed workload cluster across multiple datacenters. I have ran the sstableloader command for the tables I want to restore using snapshots which I had backed up. I have added commit log files which I had backed up from archive to a restore directory on all nodes. I have updated the commitlog_archiving.properties file with these configs. What is the correct way and order to restart nodes of my cluster? Do these considerations apply for restarting as well?
What is the Correct order to restart a cluster for point-in-time restore?
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As a general rule, we recommend restarting seed nodes in the DC first before other nodes so gossip propagation happens faster particularly for larger clusters (arbitrarily 15+ nodes). It is important to note that a restart is not required if you restored data using
sstableloader.If you are just performing a rolling restart then the order of the DCs does not matter. But it matters if you are starting up a cluster from a cold shutdown meaning all nodes are down and the cluster is completely offline.
When starting from a cold shutdown, it is important to start with the "Analytics DC" (nodes running in
Analyticsmode, i.e with Spark enabled) because it makes it easier to elect a Spark master. Assuming that the replication for Analytics keyspaces are configured with the recommended replication factor of 3, you will need to start 2 or 3 nodes beginning with the seeds ideally 1 minute apart because theLeaderManagerrequires a quorum of nodes to elect a Spark master.We recommend leaving DCs with nodes running in
Searchmode (with Solr enabled) last as a matter of convenience so that all the other DCs are operational before the cluster starts accepting Search requests from the application(s). Cheers!