The case when the integer becomes a random other integer is very difficult to debug, but I have logs that shows this. For reading strings, an exception out of it is

Here are some steps you could try: 1.Verify Serializers: Double-check your type serializers for correctness, especially for custom types. 2 Check Logs and Configurations: Look for any warning or error messages in Flink’s logs that might indicate issues with RocksDB or state handling. Review your RocksDB state backend configurations. 3 Upgrade Flink: If you’re not on the latest version, consider upgrading to benefit from potential bug fixes. 4 Hardware and Disk Checks: Verify that your disk is healthy and has sufficient space. Unstable or failing hardware can cause data corruption. 5 Enable More Debugging: Increase Flink’s logging level to DEBUG for classes related to state handling and RocksDB to get more insights into what’s happening under the hood. 6 Test with Different Backend: As a diagnostic step, you could temporarily switch to a different state backend (like the Heap backend, for testing purposes only) to isolate whether the issue is specific to RocksDB.

Let us know version information and also how the checks go starting with serializers.