[jira] [Created] (FLINK-11280) RocksDBSerializedCompositeKeyBuilder's key serializer is not being reconfigured properly

[Shang Yuanchun (Jira)]

Tzu-Li (Gordon) Tai created FLINK-11280:
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             Summary: RocksDBSerializedCompositeKeyBuilder's key serializer is not being reconfigured properly
                 Key: FLINK-11280
                 URL: https://issues.apache.org/jira/browse/FLINK-11280
             Project: Flink
          Issue Type: Bug
          Components: State Backends, Checkpointing
            Reporter: Tzu-Li (Gordon) Tai
            Assignee: Tzu-Li (Gordon) Tai


This can be confirmed by failing tests:
[https://travis-ci.org/apache/flink/jobs/476533588]

The failing test is {{StateBackendMigrationTestBase.testStateBackendRestoreSucceedsIfNewKeySerializerRequiresReconfiguration}}, which was a new test added in FLINK-11073.

This test started to fail when the changes were rebased on top of FLINK-9702.

The problem is that starting from FLINK-11073, all state serializers (including key serializer) should be wrapped within / retrieved from a {{StateSerializerProvider}}, which handles the logic of compatibility checks of state serializers and reassigning serializer references to reconfigured instances if required.

The new {{RocksDBSerializedCompositeKeyBuilder}} introduced in FLINK-9702, however, holds its own final reference directly to the key serializer, instead of using a {{StateSerializerProvider}}.
This change essentially makes the key serializer non-reconfigurable.



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