The answer to this depends on several factors: 1. Broker specs, 2. Connectivity between cluster brokers, 3. Number of messages stored in each partition, etc.
I'd still like to get a sense how long rolling upgrades take for deployments out there however. My setup: 1. 5-broker cluster with 10GBps links between them 2. Each broker with 4GB of RAM and a disk that writes at 35MB/s 3. 3 partitions, each with a replication factor of 3 4. 20M messages (80GB) per partition A rolling upgrade takes about 8 hours. I suspect this is not the norm. Kostas
