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https://issues.apache.org/jira/browse/FLINK-8522?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16343622#comment-16343622
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Stefan Richter commented on FLINK-8522:
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I don't think that we ever need to read the int, it was never read as far as I
can see because the code already starts seeking to read positions. That is why
the int never had any effect, even if it was there but not consumed. But you
should double check.
> DefaultOperatorStateBackend writes data in checkpoint that is never read.
> -------------------------------------------------------------------------
>
> Key: FLINK-8522
> URL: https://issues.apache.org/jira/browse/FLINK-8522
> Project: Flink
> Issue Type: Bug
> Components: State Backends, Checkpointing
> Affects Versions: 1.4.0
> Reporter: Kostas Kloudas
> Assignee: Kostas Kloudas
> Priority: Major
> Fix For: 1.4.1
>
>
> In the DefaultOperatorStateBackend at line 283 we write in the checkpoint an
> int declaring the number of the operator states that we include in the
> checkpoint.
> This number is never read when restoring and this can lead to confusion and
> problems with backwards compatibility and/or extension of the types of state
> we support (e.g. broadcast state).
> There are two easy solutions, either remove the line and do not write the
> size, or make sure that we also read this number when restoring and simply
> ignore it.
> I would go for the first one, i.e. remove the line. What do you think
> [~richtesn] and [~tzulitai] ?
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