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https://issues.apache.org/jira/browse/BEAM-3494?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16401919#comment-16401919
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Dawid Wysakowicz commented on BEAM-3494:
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[~suganyap] Could you elaborate a bit more how you enable checkpointing? Do I
understand correctly that you pass {{checkpointingInterval}} as cli parameter
and {{state.backend}} is set in flink-conf.yaml?
Also could you tell more what does it mean that the aggregated data is not
restored? Best with some simple example?
> Snapshot state of aggregated data of apache beam project is not maintained in
> flink's checkpointing
> ----------------------------------------------------------------------------------------------------
>
> Key: BEAM-3494
> URL: https://issues.apache.org/jira/browse/BEAM-3494
> Project: Beam
> Issue Type: Bug
> Components: runner-flink
> Reporter: suganya
> Priority: Major
>
> We have a beam project which consumes events from kafka,does a groupby in a
> time window(5 mins),after window elapses it pushes the events to downstream
> for merge.This project is deployed using flink ,we have enabled checkpointing
> to recover from failed state.
> (windowsize: 5mins , checkpointingInterval: 5mins,state.backend: filesystem)
> Offsets from kafka get checkpointed every 5
> mins(checkpointingInterval).Before finishing the entire DAG(groupBy and
> merge) , events offsets are getting checkpointed.So incase of any restart
> from task-manager ,new task gets started from last successful checkpoint ,but
> we could'nt able to get the aggregated snapshot data(data from groupBy task)
> from the persisted checkpoint.
> Able to retrieve the last successful checkpointed offset from kafka ,but
> couldnt able to get last aggregated data till checkpointing.
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