damccorm opened a new issue, #20774:
URL: https://github.com/apache/beam/issues/20774

   We were using Beam v2.23 and recently, we are testing upgrade to Beam v2.26. 
For Beam v2.26, we are passing \--experiments=use_deprecated_read and 
\--fasterCopy=true. We run into this exception when we resume our pipeline:
   ```
   
   Caused by: java.io.InvalidClassException: 
org.apache.beam.runners.flink.translation.types.CoderTypeSerializer;
   local class incompatible: stream classdesc serialVersionUID = 
5241803328188007316, local class serialVersionUID
   = 7247319138941746449 at 
java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:699) at 
java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1942)
   at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1808) at 
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2099)
   at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1625) at 
java.io.ObjectInputStream.readObject(ObjectInputStream.java:465)
   at java.io.ObjectInputStream.readObject(ObjectInputStream.java:423) at 
org.apache.flink.api.common.typeutils.TypeSerializerSerializationUtil$TypeSerializerSerializationProxy.read(TypeSerializerSerializationUtil.java:301)
   at 
org.apache.flink.api.common.typeutils.TypeSerializerSerializationUtil.tryReadSerializer(TypeSerializerSerializationUtil.java:116)
   at 
org.apache.flink.api.common.typeutils.TypeSerializerConfigSnapshot.readSnapshot(TypeSerializerConfigSnapshot.java:113)
   at 
org.apache.flink.api.common.typeutils.TypeSerializerSnapshot.readVersionedSnapshot(TypeSerializerSnapshot.java:174)
   at 
org.apache.flink.api.common.typeutils.TypeSerializerSnapshotSerializationUtil$TypeSerializerSnapshotSerializationProxy.deserializeV2(TypeSerializerSnapshotSerializationUtil.java:179)
   at 
org.apache.flink.api.common.typeutils.TypeSerializerSnapshotSerializationUtil$TypeSerializerSnapshotSerializationProxy.read(TypeSerializerSnapshotSerializationUtil.java:150)
   at 
org.apache.flink.api.common.typeutils.TypeSerializerSnapshotSerializationUtil.readSerializerSnapshot(TypeSerializerSnapshotSerializationUtil.java:76)
   at 
org.apache.flink.runtime.state.metainfo.StateMetaInfoSnapshotReadersWriters$CurrentReaderImpl.readStateMetaInfoSnapshot(StateMetaInfoSnapshotReadersWriters.java:219)
   at 
org.apache.flink.runtime.state.OperatorBackendSerializationProxy.read(OperatorBackendSerializationProxy.java:119)
   at 
org.apache.flink.runtime.state.OperatorStateRestoreOperation.restore(OperatorStateRestoreOperation.java:83)
   It looks like it is not able to deserialize objects from our existing 
checkpoints.
   ```
   
   
   Imported from Jira 
[BEAM-11583](https://issues.apache.org/jira/browse/BEAM-11583). Original Jira 
may contain additional context.
   Reported by: antoniosi.


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