[jira] [Created] (FLINK-25479) Changlog materialization with incremental checkpoint cannot work well in local tests

["Yun Tang (Jira)" <ji...@apache.org>]

Yun Tang created FLINK-25479:
--------------------------------

             Summary: Changlog materialization with incremental checkpoint cannot work well in local tests
                 Key: FLINK-25479
                 URL: https://issues.apache.org/jira/browse/FLINK-25479
             Project: Flink
          Issue Type: Bug
          Components: Runtime / Checkpointing, Runtime / State Backends, Tests
            Reporter: Yun Tang
             Fix For: 1.15.0


Currently, changelog materialization would call RocksDB state backend's snapshot method to generate {{IncrementalRemoteKeyedStateHandle}} as ChangelogStateBackendHandleImpl's materialized artifacts. And before next materialization, it will always report the same {{IncrementalRemoteKeyedStateHandle}} as before.

For local tests, TM would report the {{IncrementalRemoteKeyedStateHandle}} to JM via local {{LocalRpcInvocation}}. However, as {{LocalRpcInvocation}} would not de/serialize message, which leads once we register the {{IncrementalRemoteKeyedStateHandle}} on JM side, it will also add a {{sharedStateRegistry}} to the one located on TM side. For the 2nd checkpoint, TM would reported same {{IncrementalRemoteKeyedStateHandle}} with  {{sharedStateRegistry}} to JM. And it will then throw exception as it already contains a {{sharedStateRegistry}}:

IncrementalRemoteKeyedStateHandle
{code:java}
public void registerSharedStates(SharedStateRegistry stateRegistry, long checkpointID) {
       Preconditions.checkState(
                sharedStateRegistry != stateRegistry,
                "The state handle has already registered its shared states to the given registry.");

}
{code}

This bug would go in distribution environment as {{IncrementalRemoteKeyedStateHandle}} would be serialized and {{sharedStateRegistry}} is tagged as {{transient}}.



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