[jira] [Issue Comment Deleted] (BEAM-3194) Support annotating that a DoFn requires stable / deterministic input for replay/retry

["Kenneth Knowles (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/BEAM-3194?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kenneth Knowles updated BEAM-3194:
----------------------------------
    Comment: was deleted

(was: kennknowles commented on a change in pull request #4135: [BEAM-3194] Add @RequiresStableInput annotation
URL: https://github.com/apache/beam/pull/4135#discussion_r153614478
 
 

 ##########
 File path: sdks/java/core/src/main/java/org/apache/beam/sdk/transforms/DoFn.java
 ##########
 @@ -567,6 +567,29 @@ public Duration getAllowedTimestampSkew() {
   @Target(ElementType.METHOD)
   public @interface ProcessElement {}
 
+  /**
+   * <b><i>Experimental - no backwards compatibility guarantees. The exact name or usage of this
+   * feature may change.</i></b>
+   *
+   * <p>Annotation that may be added to a {@link ProcessElement} or {@link OnTimer} method to
 
 Review comment:
   The part relevant for a timer is that "the observable contents of... mutable state must be stable upon retries".

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> Support annotating that a DoFn requires stable / deterministic input for replay/retry
> -------------------------------------------------------------------------------------
>
>                 Key: BEAM-3194
>                 URL: https://issues.apache.org/jira/browse/BEAM-3194
>             Project: Beam
>          Issue Type: New Feature
>          Components: beam-model
>            Reporter: Kenneth Knowles
>            Assignee: Eugene Kirpichov
>            Priority: Major
>
> See the thread: https://lists.apache.org/thread.html/5fd81ce371aeaf642665348f8e6940e308e04275dd7072f380f9f945@%3Cdev.beam.apache.org%3E
> We need this in order to have truly cross-runner end-to-end exactly once via replay + idempotence.



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