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https://issues.apache.org/jira/browse/FLINK-5480?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16424244#comment-16424244
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ASF GitHub Bot commented on FLINK-5480:
---------------------------------------

Github user ShashwatRastogi-Reflektion commented on the issue:

    https://github.com/apache/flink/pull/3117
  
    @zentol I am using flink 1.3.2.
    Normally, I don't use `--allowNonRestoredState` and I get an error while 
restarting the job. After using this `allowNonRestoredState` the job starts up 
fine but there is a data loss because of lost state, which is what I want to 
avoid.
    I think, the problem with my implementation is that I am wrongly assigning 
some ids to the operators. Is there sure-shot way of finding out uid or 
uid-hash generated by flink for each operator(with/without chaining) ?


> User-provided hashes for operators
> ----------------------------------
>
>                 Key: FLINK-5480
>                 URL: https://issues.apache.org/jira/browse/FLINK-5480
>             Project: Flink
>          Issue Type: Improvement
>          Components: DataStream API
>    Affects Versions: 1.2.0
>            Reporter: Stefan Richter
>            Assignee: Stefan Richter
>            Priority: Major
>             Fix For: 1.2.0, 1.3.0
>
>
> We could allow users to provided (alternative) hashes for operators in a 
> StreamGraph. This can make migration between Flink versions easier, in case 
> the automatically produced hashes between versions are incompatible. For 
> example, users could just copy the old hashes from the web ui to their job.



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