Igniters, I propose new public API to change the cache configuration of persistent caches with keeping data.
It would look like: Ignite ignite = ...; ignite.restartCaches(cfg1, ... cfgN); where cfgX is a new cache configuration, which contains the name of an existing persistent cache. The obvious limitation: - affinity key mapping couldn't be changed; - count of partitions couldn't be changed; - MVCC couldn't be turned off/on; - persistent couldn't be turned off; - group settings couldn't be changed (group name); - if cache belongs to group it's needed to restart all of them. Failure scenario is the crucial thing (and most difficult): - initiator fail; - cluster restart at any stage; - joining/starting offline nodes. Some thoughts about implementation: - stop cache with destroy=false; - start cache dynamically with new configuration; - if indexes settings changed - remove index.bin to start indexation; - change blt-history when start cache initiated to not allow join nodes with old configuration; - use restartId (IGNITE-8911) to not allow to start cache in between. Your thoughts? Would it be a useful feature?
