启动Flink作业时，它可以在HDFS上找到检查点文件，但是反序列化期间会发生异常，例如：
java.lang.IllegalStateException: Could not initialize operator state backend.
at org.apache.flink.streaming.api.operators.AbstractStreamOperator.initOperatorState(AbstractStreamOperator.java:302)
at org.apache.flink.streaming.api.operators.AbstractStreamOperator.initializeState(AbstractStreamOperator.java:249)
at org.apache.flink.streaming.runtime.tasks.StreamTask.initializeOperators(StreamTask.java:692)
at org.apache.flink.streaming.runtime.tasks.StreamTask.initializeState(StreamTask.java:679)
at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:253)
at org.apache.flink.runtime.taskmanager.Task.run(Task.java:718)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.io.EOFException
at java.io.DataInputStream.readFully(DataInputStream.java:197)
at java.io.DataInputStream.readLong(DataInputStream.java:416)
at org.apache.flink.api.common.typeutils.base.LongSerializer.deserialize(LongSerializer.java:68)
at org.apache.flink.api.common.typeutils.base.LongSerializer.deserialize(LongSerializer.java:27)
at org.apache.flink.api.java.typeutils.runtime.TupleSerializer.deserialize(TupleSerializer.java:136)
at org.apache.flink.api.java.typeutils.runtime.TupleSerializer.deserialize(TupleSerializer.java:30)
at org.apache.flink.runtime.state.DefaultOperatorStateBackend.deserializeStateValues(DefaultOperatorStateBackend.java:584)
at org.apache.flink.runtime.state.DefaultOperatorStateBackend.restore(DefaultOperatorStateBackend.java:399)
at org.apache.flink.streaming.runtime.tasks.StreamTask.createOperatorStateBackend(StreamTask.java:733)
at org.apache.flink.streaming.api.operators.AbstractStreamOperator.initOperatorState(AbstractStreamOperator.java:300)
不清楚readLong意味着什么。
任何想法都会受到赞赏。