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  1. Flink
  2. FLINK-13159

java.lang.ClassNotFoundException when restore job

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      java.lang.Exception: Exception while creating StreamOperatorStateContext.
      at org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl.streamOperatorStateContext(StreamTaskStateInitializerImpl.java:195)
      at org.apache.flink.streaming.api.operators.AbstractStreamOperator.initializeState(AbstractStreamOperator.java:250)
      at org.apache.flink.streaming.runtime.tasks.StreamTask.initializeState(StreamTask.java:738)
      at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:289)
      at org.apache.flink.runtime.taskmanager.Task.run(Task.java:711)
      at java.lang.Thread.run(Thread.java:748)
      Caused by: org.apache.flink.util.FlinkException: Could not restore keyed state backend for WindowOperator_b398b3dd4c544ddf2d47a0cc47d332f4_(1/6) from any of the 1 prov
      ided restore options.
      at org.apache.flink.streaming.api.operators.BackendRestorerProcedure.createAndRestore(BackendRestorerProcedure.java:135)
      at org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl.keyedStatedBackend(StreamTaskStateInitializerImpl.java:307)
      at org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl.streamOperatorStateContext(StreamTaskStateInitializerImpl.java:135)
      ... 5 common frames omitted
      Caused by: org.apache.flink.runtime.state.BackendBuildingException: Failed when trying to restore heap backend
      at org.apache.flink.runtime.state.heap.HeapKeyedStateBackendBuilder.build(HeapKeyedStateBackendBuilder.java:130)
      at org.apache.flink.runtime.state.filesystem.FsStateBackend.createKeyedStateBackend(FsStateBackend.java:489)
      at org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl.lambda$keyedStatedBackend$1(StreamTaskStateInitializerImpl.java:291)
      at org.apache.flink.streaming.api.operators.BackendRestorerProcedure.attemptCreateAndRestore(BackendRestorerProcedure.java:142)
      at org.apache.flink.streaming.api.operators.BackendRestorerProcedure.createAndRestore(BackendRestorerProcedure.java:121)
      ... 7 common frames omitted
      Caused by: java.lang.RuntimeException: Cannot instantiate class.
      at org.apache.flink.api.java.typeutils.runtime.PojoSerializer.deserialize(PojoSerializer.java:384)
      at org.apache.flink.runtime.state.heap.StateTableByKeyGroupReaders.lambda$createV2PlusReader$0(StateTableByKeyGroupReaders.java:74)
      at org.apache.flink.runtime.state.KeyGroupPartitioner$PartitioningResultKeyGroupReader.readMappingsInKeyGroup(KeyGroupPartitioner.java:297)
      at org.apache.flink.runtime.state.heap.HeapRestoreOperation.readKeyGroupStateData(HeapRestoreOperation.java:290)
      at org.apache.flink.runtime.state.heap.HeapRestoreOperation.readStateHandleStateData(HeapRestoreOperation.java:251)
      at org.apache.flink.runtime.state.heap.HeapRestoreOperation.restore(HeapRestoreOperation.java:153)
      at org.apache.flink.runtime.state.heap.HeapKeyedStateBackendBuilder.build(HeapKeyedStateBackendBuilder.java:127)
      ... 11 common frames omitted
      Caused by: java.lang.ClassNotFoundException: xxx
      at java.lang.Class.forName0(Native Method)
      at java.lang.Class.forName(Class.java:348)
      at org.apache.flink.api.java.typeutils.runtime.PojoSerializer.deserialize(PojoSerializer.java:382)
      ... 17 common frames omitted
      

      A strange problem with Flink is that after a task has been running properly for a period of time, if any exception (such as ask timeout or ES request timeout) is thrown, the task restart will report the above error (xxx is a business model), and ten subsequent retries will not succeed, but the task will be resubmitted. Then it can run normally. In addition, there are three other tasks running at the same time, none of which has the problem.

      My flink version is 1.8.0.

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            yunta Yun Tang
            kring kring
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