What if I’m using RocksDB, and MapState had single entry and TypeSerializer1, then we take save point upgrade job (TypeSerializer2), put new entry, at that point we have two entries written by different serializers, so both TypeSerializers should be stored in meta information? Thanks, Alexey
________________________________ From: Andrey Zagrebin <and...@data-artisans.com> Sent: Wednesday, November 28, 2018 2:23 AM To: Alexey Trenikhun Cc: user@flink.apache.org Subject: Re: MapState - TypeSerializer Hi Alexey, it is written once per state name in its meta information, apart from user data entries. Best, Andrey On 28 Nov 2018, at 04:56, Alexey Trenikhun <yen...@msn.com<mailto:yen...@msn.com>> wrote: Hello, Flink documentation states that “TypeSerializers and TypeSerializerConfigSnapshots are written as part of checkpoints along with the state values”, in context of MapState, does it mean TypeSerializer per each MapState entry or only once per state? Alexey
