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https://issues.apache.org/jira/browse/BEAM-3069?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17546710#comment-17546710
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Kenneth Knowles commented on BEAM-3069:
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This issue has been migrated to https://github.com/apache/beam/issues/18546
> Transform rehydrator registration should be idempotent
> ------------------------------------------------------
>
> Key: BEAM-3069
> URL: https://issues.apache.org/jira/browse/BEAM-3069
> Project: Beam
> Issue Type: Bug
> Components: runner-core
> Reporter: Kenneth Knowles
> Priority: P3
>
> Currently, if the same URN is registered twice, it results in an exception.
> Instead, if it is a duplicate registration (for example, caused by
> double-shading of the service loader config) it should succeed. This requires
> probably good equals methods for the rehydrators.
> Other minor issues: it will fail at load time and from then throw class not
> found errors, which is extremely annoying. It should instead load lazily so
> we can always get a good stack trace.
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