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https://issues.apache.org/jira/browse/FLINK-23035?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17597913#comment-17597913
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Roman Khachatryan commented on FLINK-23035:
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As discussed offline, I planned to have two classes instead of StateChange :
one for data changes and one metadata changes. So that
StateChangeFormat.writeChangeSetcan explicitly put metadata changes first, and
then still group data changes by keygroup.
> Add explicit method to StateChangelogWriter to write metadata
> -------------------------------------------------------------
>
> Key: FLINK-23035
> URL: https://issues.apache.org/jira/browse/FLINK-23035
> Project: Flink
> Issue Type: Technical Debt
> Components: Runtime / State Backends
> Reporter: Roman Khachatryan
> Priority: Minor
> Fix For: 1.16.0
>
>
> Currently, metadata is written to the state changelog using the same
> StateChangelogWriter.append() method as data.
> However, it doesn't belong to a specific group, and should be read first on
> recovery. Because of that, -1 is used.
> An explicit append() without keygroup would be less fragile (probably still
> using -1 under the hood).
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