klion26 commented on a change in pull request #8565: [FLINK-11947] Support
MapState value schema evolution for RocksDB
URL: https://github.com/apache/flink/pull/8565#discussion_r289797886
##########
File path:
flink-state-backends/flink-statebackend-rocksdb/src/main/java/org/apache/flink/contrib/streaming/state/RocksDBKeyedStateBackend.java
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@@ -538,13 +539,19 @@ public void notifyCheckpointComplete(long
completedCheckpointId) throws Exceptio
* the key here, which is made up of key group, key, namespace and map
key
* (in case of MapState).
*/
+ @SuppressWarnings("unchecked")
private <N, S extends State, SV> void migrateStateValues(
StateDescriptor<S, SV> stateDesc,
Tuple2<ColumnFamilyHandle,
RegisteredKeyValueStateBackendMetaInfo<N, SV>> stateMetaInfo) throws Exception {
if (stateDesc.getType() == StateDescriptor.Type.MAP) {
- throw new StateMigrationException("The new serializer
for a MapState requires state migration in order for the job to proceed." +
- " However, migration for MapState currently
isn't supported.");
+ TypeSerializer priorUserKeySerializer =
((MapSerializer)
stateMetaInfo.f1.getPreviousStateSerializer()).getKeySerializer();
+ TypeSerializer newUserKeySerializer = ((MapSerializer)
stateMetaInfo.f1.getStateSerializer()).getKeySerializer();
+ TypeSerializerSchemaCompatibility compatibility =
priorUserKeySerializer.snapshotConfiguration().resolveSchemaCompatibility(newUserKeySerializer);
Review comment:
fix it.
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