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https://issues.apache.org/jira/browse/FLINK-31356?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17702651#comment-17702651
]
John commented on FLINK-31356:
------------------------------
I know the reason through debugging.
My old pojo does not have a parameterless constructor, and the system uses
*KryoSerializer* for serialization.
After I add the parameterless constructor, the system uses *PojoSerializer* for
serialization, but the property *_subclassSerializerCache_* still retains that
my pojo should be deserialized with {*}KryoSerializer{*}, which causes problems.
{code:java}
TypeSerializer<?> getSubclassSerializer(Class<?> subclass) {
TypeSerializer<?> result = subclassSerializerCache.get(subclass);
if (result == null) {
result = createSubclassSerializer(subclass);
subclassSerializerCache.put(subclass, result);
}
return result;
} {code}
normally by removing this cache when restoring, I hope the official can improve
this problem later
{code:java}
PojoSerializer(
Class<T> clazz,
Field[] fields,
TypeSerializer<Object>[] fieldSerializers,
LinkedHashMap<Class<?>, Integer> registeredClasses,
TypeSerializer<?>[] registeredSerializers,
Map<Class<?>, TypeSerializer<?>> subclassSerializerCache,
ExecutionConfig executionConfig) {
this.clazz = checkNotNull(clazz);
this.fields = checkNotNull(fields);
this.numFields = fields.length;
this.fieldSerializers = checkNotNull(fieldSerializers);
this.registeredClasses = checkNotNull(registeredClasses);
this.registeredSerializers = checkNotNull(registeredSerializers);
this.subclassSerializerCache = checkNotNull(subclassSerializerCache);
this.subclassSerializerCache.entrySet().removeIf(next ->
"xxx".equals(next.getKey().getName()));
this.executionConfig = checkNotNull(executionConfig);
this.cl = Thread.currentThread().getContextClassLoader();
} {code}
> Serialize garbled characters at checkpoint
> ------------------------------------------
>
> Key: FLINK-31356
> URL: https://issues.apache.org/jira/browse/FLINK-31356
> Project: Flink
> Issue Type: Bug
> Components: API / Type Serialization System
> Affects Versions: 1.13.6
> Reporter: John
> Priority: Major
>
>
> {panel:title=The last checkpoint of the program was successful}
> 2023-03-07 08:33:16,085 INFO
> org.apache.flink.runtime.checkpoint.CheckpointCoordinator [] - Triggering
> checkpoint 39126 (type=CHECKPOINT) @ 1678149196059 for job
> 8b5720a4a40f50b995c97c6fe5b93079.
> 2023-03-07 08:33:16,918 INFO
> org.apache.flink.runtime.checkpoint.CheckpointCoordinator [] - Completed
> checkpoint 39126 for job 8b5720a4a40f50b995c97c6fe5b93079 (71251394 bytes in
> 849 ms).
> 2023-03-07 08:33:16,918 INFO
> org.apache.flink.runtime.source.coordinator.SourceCoordinator [] - Marking
> checkpoint 39126 as completed for source Source: kafkaDataStream.
> 2023-03-07 08:36:10,444 INFO
> org.apache.flink.runtime.executiongraph.ExecutionGraph [] - Sink:
> mysqlSink (1/2) (898af6700ac9cd087c763cef0b5585d4) switched from RUNNING to
> FAILED on container_e38_1676011848026_0012_01_000002 @ xxxx (dataPort=44633).
> java.lang.RuntimeException: Writing records to JDBC failed.
> at
> org.apache.flink.connector.jdbc.internal.JdbcBatchingOutputFormat.checkFlushException(JdbcBatchingOutputFormat.java:153)
> ~[flink-connector-jdbc_2.11-1.13.6.jar:1.13.6]
> {panel}
> {panel:title=But from this checkpoint restore, it can't be decoded}
> Caused by: org.apache.flink.util.FlinkException: Could not restore keyed
> state backend for WindowOperator_a1b6a20a1eb2801464c79c8d018a24d1_(1/2) from
> any of the 1 provided restore options.
> at
> org.apache.flink.streaming.api.operators.BackendRestorerProcedure.createAndRestore(BackendRestorerProcedure.java:160)
> ~[flink-dist_2.11-1.13.6.jar:1.13.6]
> at
> org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl.keyedStatedBackend(StreamTaskStateInitializerImpl.java:345)
> ~[flink-dist_2.11-1.13.6.jar:1.13.6]
> at
> org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl.streamOperatorStateContext(StreamTaskStateInitializerImpl.java:163)
> ~[flink-dist_2.11-1.13.6.jar:1.13.6]
> ... 10 more
> Caused by: org.apache.flink.runtime.state.BackendBuildingException: Failed
> when trying to restore heap backend
> at
> org.apache.flink.runtime.state.heap.HeapKeyedStateBackendBuilder.restoreState(HeapKeyedStateBackendBuilder.java:177)
> ~[flink-dist_2.11-1.13.6.jar:1.13.6]
> at
> org.apache.flink.runtime.state.heap.HeapKeyedStateBackendBuilder.build(HeapKeyedStateBackendBuilder.java:111)
> ~[flink-dist_2.11-1.13.6.jar:1.13.6]
> at
> org.apache.flink.runtime.state.hashmap.HashMapStateBackend.createKeyedStateBackend(HashMapStateBackend.java:131)
> ~[flink-dist_2.11-1.13.6.jar:1.13.6]
> at
> org.apache.flink.runtime.state.hashmap.HashMapStateBackend.createKeyedStateBackend(HashMapStateBackend.java:73)
> ~[flink-dist_2.11-1.13.6.jar:1.13.6]
> at
> org.apache.flink.runtime.state.StateBackend.createKeyedStateBackend(StateBackend.java:136)
> ~[flink-dist_2.11-1.13.6.jar:1.13.6]
> at
> org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl.lambda$keyedStatedBackend$1(StreamTaskStateInitializerImpl.java:328)
> ~[flink-dist_2.11-1.13.6.jar:1.13.6]
> at
> org.apache.flink.streaming.api.operators.BackendRestorerProcedure.attemptCreateAndRestore(BackendRestorerProcedure.java:168)
> ~[flink-dist_2.11-1.13.6.jar:1.13.6]
> at
> org.apache.flink.streaming.api.operators.BackendRestorerProcedure.createAndRestore(BackendRestorerProcedure.java:135)
> ~[flink-dist_2.11-1.13.6.jar:1.13.6]
> at
> org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl.keyedStatedBackend(StreamTaskStateInitializerImpl.java:345)
> ~[flink-dist_2.11-1.13.6.jar:1.13.6]
> at
> org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl.streamOperatorStateContext(StreamTaskStateInitializerImpl.java:163)
> ~[flink-dist_2.11-1.13.6.jar:1.13.6]
> ... 10 more
> Caused by: java.io.UTFDataFormatException: malformed input around byte 32
> at java.io.DataInputStream.readUTF(DataInputStream.java:656)
> ~[?:1.8.0_201]
> at java.io.DataInputStream.readUTF(DataInputStream.java:564)
> ~[?:1.8.0_201]
> at
> org.apache.flink.api.java.typeutils.runtime.PojoSerializer.deserialize(PojoSerializer.java:379)
> ~[flink-core-1.13.6.jar:1.13.6]
> at
> org.apache.flink.api.common.typeutils.base.MapSerializer.deserialize(MapSerializer.java:155)
> ~[flink-core-1.13.6.jar:1.13.6]
> at
> org.apache.flink.api.common.typeutils.base.MapSerializer.deserialize(MapSerializer.java:43)
> ~[flink-core-1.13.6.jar:1.13.6]
> at
> org.apache.flink.runtime.state.heap.StateTableByKeyGroupReaders.lambda$createV2PlusReader$0(StateTableByKeyGroupReaders.java:79)
> ~[flink-dist_2.11-1.13.6.jar:1.13.6]
> at
> org.apache.flink.runtime.state.KeyGroupPartitioner$PartitioningResultKeyGroupReader.readMappingsInKeyGroup(KeyGroupPartitioner.java:297)
> ~[flink-dist_2.11-1.13.6.jar:1.13.6]
> at
> org.apache.flink.runtime.state.heap.HeapRestoreOperation.readKeyGroupStateData(HeapRestoreOperation.java:258)
> ~[flink-dist_2.11-1.13.6.jar:1.13.6]
> at
> org.apache.flink.runtime.state.heap.HeapRestoreOperation.readStateHandleStateData(HeapRestoreOperation.java:220)
> ~[flink-dist_2.11-1.13.6.jar:1.13.6]
> at
> org.apache.flink.runtime.state.heap.HeapRestoreOperation.restore(HeapRestoreOperation.java:166)
> ~[flink-dist_2.11-1.13.6.jar:1.13.6]
> at
> org.apache.flink.runtime.state.heap.HeapRestoreOperation.restore(HeapRestoreOperation.java:62)
> ~[flink-dist_2.11-1.13.6.jar:1.13.6]
> at
> org.apache.flink.runtime.state.heap.HeapKeyedStateBackendBuilder.restoreState(HeapKeyedStateBackendBuilder.java:174)
> ~[flink-dist_2.11-1.13.6.jar:1.13.6]
> at
> org.apache.flink.runtime.state.heap.HeapKeyedStateBackendBuilder.build(HeapKeyedStateBackendBuilder.java:111)
> ~[flink-dist_2.11-1.13.6.jar:1.13.6]
> at
> org.apache.flink.runtime.state.hashmap.HashMapStateBackend.createKeyedStateBackend(HashMapStateBackend.java:131)
> ~[flink-dist_2.11-1.13.6.jar:1.13.6]
> at
> org.apache.flink.runtime.state.hashmap.HashMapStateBackend.createKeyedStateBackend(HashMapStateBackend.java:73)
> ~[flink-dist_2.11-1.13.6.jar:1.13.6]
> at
> org.apache.flink.runtime.state.StateBackend.createKeyedStateBackend(StateBackend.java:136)
> ~[flink-dist_2.11-1.13.6.jar:1.13.6]
> at
> org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl.lambda$keyedStatedBackend$1(StreamTaskStateInitializerImpl.java:328)
> ~[flink-dist_2.11-1.13.6.jar:1.13.6]
> at
> org.apache.flink.streaming.api.operators.BackendRestorerProcedure.attemptCreateAndRestore(BackendRestorerProcedure.java:168)
> ~[flink-dist_2.11-1.13.6.jar:1.13.6]
> at
> org.apache.flink.streaming.api.operators.BackendRestorerProcedure.createAndRestore(BackendRestorerProcedure.java:135)
> ~[flink-dist_2.11-1.13.6.jar:1.13.6]
> at
> org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl.keyedStatedBackend(StreamTaskStateInitializerImpl.java:345)
> ~[flink-dist_2.11-1.13.6.jar:1.13.6]
> at
> org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl.streamOperatorStateContext(StreamTaskStateInitializerImpl.java:163)
> ~[flink-dist_2.11-1.13.6.jar:1.13.6]
> {panel}
>
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