2pk03 opened a new pull request, #640:
URL: https://github.com/apache/incubator-wayang/pull/640

   Port object-file IO onto a safe codec
   ------------------------------------
   
   - add `ObjectFileSerializationMode` + helper to switch between legacy Java 
serialization and a JSON-based format, with unit tests covering both paths
   - rework Java/Flink/Spark object-file sources/sinks (and Flink’s output 
format) to use the shared serializer, log deprecation warnings for the legacy 
mode, and stop calling raw `ObjectInputStream`
   - update Spark’s SequenceFile readers/writers to chunk records via RDD 
transformations and share logic with the new serializer
   
   Motivation: the legacy path deserializes untrusted SequenceFile payloads via 
`ObjectInputStream.readObject`, letting an attacker ship a gadget chain that 
runs arbitrary bytecode inside the Wayang JVM. That RCE can be used to execute 
system commands, exfiltrate data, or tamper with jobs, so we move to JSON by 
default and require explicit opt-in for the old codec.
   
   Replaces PR #638


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