Re: state reset(lost) on TM recovery

Posted by Chesnay Schepler on
URL: http://deprecated-apache-flink-user-mailing-list-archive.369.s1.nabble.com/state-reset-lost-on-TM-recovery-tp40492p40524.html

Just do double-check, are you aware that ValueState within a Keyed*Function is scoped to the key of the input element(s)? I.e., any stored value is only accessible if an element with the same key is processed?

On 1/10/2021 7:18 PM, Alexey Trenikhun wrote:

Hello,

I'm using Flink 1.11.3, state backend is rocksdn. I have streaming job which reads from Kafka, transforms data and output into Kafka, one of processing nodes is KeyedCoProcessFunction with ValueState:

1. generated some input data, I see in log that state.update() is called and subsequent state.value() return not null
2. wait for checkpoint
3. restart taskmanager
4. state.value() returns null

I've tried to change backend from rocksdb to filesystem - same result, after taskmanager restart state.value() returns null

Any ideas, what could cause resetting state to null?

Thanks,

Alexey