问题
I have multiple datacenters. One of them is Cassandra other one is Solr datacenter. I already started upgrading process. Still 1 node is being upgrading since "upgradesstables" command have been taking for 4 days.
I want to add new cassandra datacenter and i dont have time to wait upgrading process is done. Can i add new cassandra datacenter with version 5.0.2 while there is upgrading process is going on.
回答1:
Although you can run a cluster in a partially upgraded state, it is a transient state and not a situation you'd want your cluster to be in for any length of time. There's some operations you should avoid while the cluster is in a partially upgraded state and also your cluster will show a schema disagreement while in this state.
I would say its best to not add that new DC into the mix. Please see the upgrade limitations here:
https://docs.datastax.com/en/latest-upgrade/upgrade/datastax_enterprise/upgdDSE50.html#upgdDSE50__restrictions
来源：https://stackoverflow.com/questions/39557058/add-new-datacenter-during-datastax-upgrade-4-8-8-to-5-0-2