Hi, We are currently in the process of upgrading our environment from 3.0.27 to 4.0.4. However I see some issues with hints not being sent from v3 nodes to v4 nodes.
We have a test environment with 2DCs, we are currently writing to DC1 and DC2 have been upgraded from version 3.0.27 -> 4.0.4 After the upgrade I see that all the v3 nodes in DC1 have hint files stored for all the upgraded nodes in DC2. These files where created while the nodes in DC2 was upgraded, however they do not disappear and there is nothing in the logs mentioning anything about these files. Does this mean that data written while a node is being upgraded is not replicated to that node? Hint related configs: hinted_handoff_enabled: true max_hint_window_in_ms: 172800000 # 48 hourshinted_handoff_throttle_in_kb: 10240 max_hints_delivery_threads: 8 hints_directory: /var/lib/cassandra/hints hints_flush_period_in_ms: 10000 max_hints_file_size_in_mb: 12 Regards Morten
