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https://issues.apache.org/jira/browse/FLINK-39375?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated FLINK-39375:
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Labels: pull-request-available (was: )
> Add explicit serialVersionUID to WatermarkAlignmentParams
> ---------------------------------------------------------
>
> Key: FLINK-39375
> URL: https://issues.apache.org/jira/browse/FLINK-39375
> Project: Flink
> Issue Type: Improvement
> Components: API / Core
> Reporter: Liu
> Priority: Major
> Labels: pull-request-available
>
> {{WatermarkAlignmentParams}} implements {{Serializable}} but does not declare
> an explicit {{{}serialVersionUID{}}}.
> Without an explicit {{{}serialVersionUID{}}}, the JVM auto-generates one
> based on the class structure (fields, methods, etc.). If the class is
> modified in a future release — even with a minor, non-breaking change — the
> auto-generated UID will change, causing {{InvalidClassException}} during
> deserialization.
> This is particularly problematic in Flink because
> {{WatermarkAlignmentParams}} may be serialized as part of job graphs and
> checkpoints/savepoints. A changed UID would prevent users from restoring
> savepoints taken on a prior version after upgrading Flink, breaking savepoint
> compatibility.
> Additionally, the class is annotated with {{{}@PublicEvolving{}}}, which
> means it is part of Flink's public API and should maintain backward
> compatibility.
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