Hi, folks: I am planning to upgrade our production from dsc 2.0.16 to 2.1.18
for 2 DC (20 nodes each, 600GB per node). Few questions:1), what happen when
doing rolling upgrade? Let''s say we upgrade only one node to new version,
before upgrade sstable, the data coming in will stay in the node and not be
able to stream to other nodes?2), What if I have very active writes? how much
data it can hold until it sees other nodes with new version so it can
stream?3), Should I upgrade sstable when all nodes in one DC upgraded? or wait
until all 2 DC upgraded?4), any idea or experience how long it will take to
upgrade sstable for 600 GB data on each node?5), what is the max time I can
take for rolling upgrade on each DC?6), I was doing a test with 3-nodes
cluster, one node with 2.1.18, other two are 2.0.16. I got a warning on the
node with newer version when I tried to create keyspace and insert some sample
data:"Warning: schema version mismatch detected, which might be caused by DOWN
nodes; if this is not the case, check the schema versions of your nodes in
system.local and system.peers. OperationTimedOut: errors={}, last_host=xxx"But
data upserted successfully, even not be seen on other nodes. Any
suggestion?Great thanks for any help or comments!- Park
