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https://issues.apache.org/jira/browse/FLINK-7461?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16129115#comment-16129115
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ASF GitHub Bot commented on FLINK-7461:
---------------------------------------

Github user dawidwys commented on the issue:

    https://github.com/apache/flink/pull/4550
  
    Just wanted to add to what @kl0u said that if we remove the compatibility 
with <= 1.2 of CEP library  there will be lot more code that will be no longer 
used than just that in this PR. E.g.
    
    - `NFA#migrateNFA`
    - `NFACompiler#migrateGraph`
    - `SharedBuffer#migrateSharedBuffer`
    - `SharedBuffer#readObject`
    
    just to name a few. I think it would be really important to create a 
following JIRA to introduce those changes in CEP, if we proceed with this PR.


> Remove Backwards compatibility for Flink 1.1 from Flink 1.4
> -----------------------------------------------------------
>
>                 Key: FLINK-7461
>                 URL: https://issues.apache.org/jira/browse/FLINK-7461
>             Project: Flink
>          Issue Type: Improvement
>    Affects Versions: 1.4.0
>            Reporter: Stefan Richter
>            Assignee: Stefan Richter
>
> This issue tracks the removal of Flink 1.1 backwards compatibility from Flink 
> 1.4. This step is helpful for further developments because it will remove 
> many old code paths and special cases. In particular, we can drop all 
> handling for non-partitionable state, i.e. state that was created with the 
> old {{Checkpointed}} interface.



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