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From "Aljoscha Krettek (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-8413) Snapshot state of aggregated data is not maintained in flink's checkpointing
Date Wed, 24 Jan 2018 13:05:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-8413?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16337559#comment-16337559
] 

Aljoscha Krettek commented on FLINK-8413:
-----------------------------------------

Did you enable checkpointing and specify a path in HDFS (or some other DFS) where checkpoints
should go?

> Snapshot state of aggregated data is not maintained in flink's checkpointing
> ----------------------------------------------------------------------------
>
>                 Key: FLINK-8413
>                 URL: https://issues.apache.org/jira/browse/FLINK-8413
>             Project: Flink
>          Issue Type: Bug
>          Components: State Backends, Checkpointing
>    Affects Versions: 1.3.2
>            Reporter: suganya
>            Priority: Major
>
> We have a 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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