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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