je-ik commented on code in PR #30403:
URL: https://github.com/apache/beam/pull/30403#discussion_r1500481060
##########
sdks/java/core/src/main/java/org/apache/beam/sdk/transforms/PTransform.java:
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@@ -143,6 +143,9 @@
*/
public abstract class PTransform<InputT extends PInput, OutputT extends
POutput>
implements Serializable /* See the note above */, HasDisplayData {
+
+ private static final long serialVersionUID = 3383862966597863311L;
Review Comment:
Unfortunately Flink uses Java serialization to serialize checkpoints (via
SerializableCoder) in legacy Read transform (needed for KafkaIO), so without
stabilizing this we are unable to upgrade even with the
SerializablePipelineOptions moved back.
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