Apache flink 无法使用Flink处理器API还原检查点状态

主程序使用kafka事件，然后过滤->映射->按键->CEP->接收。我编写了另一个单独的简单程序来读取检查点目录，如下所示：

object StateReader extends App {

  val path = "file://...."

  val env = ExecutionEnvironment.getExecutionEnvironment

  val chk = Savepoint.load(env.getJavaEnv, path, new FsStateBackend(path))

  val ds = chk.readKeyedState("cep", new CepOperatorReadFunction, TypeInformation.of(classOf[KEY]), TypeInformation.of(classOf[VALUE]))
  println(ds.count())

}

class CepOperatorReadFunction extends KeyedStateReaderFunction[KEY, VALUE] {
  override def open(parameters: Configuration): Unit = {

  }
  override def readKey(k: KEY, context: KeyedStateReaderFunction.Context, collector: Collector[VALUE]): Unit = {

  }//end readKey
}//end class CepOperatorReadFunction

但是，我得到了以下例外：

Caused by: java.lang.IllegalStateException: Unexpected state handle type, expected: class org.apache.flink.runtime.state.KeyGroupsStateHandle, but found: class org.apache.flink.runtime.state.IncrementalRemoteKeyedStateHandle
    at org.apache.flink.runtime.state.heap.HeapRestoreOperation.restore(HeapRestoreOperation.java:120)
    at org.apache.flink.runtime.state.heap.HeapKeyedStateBackendBuilder.build(HeapKeyedStateBackendBuilder.java:114)
    ... 13 more

以下是

flink-conf.yaml

state.backend: rocksdb
state.checkpoints.dir: hdfs:///.../checkpoints
state.savepoints.dir: hdfs:///.../savepoints
state.backend.incremental: true
state.backend.rocksdb.memory.write-buffer-ratio: 0.6
state.backend.rocksdb.localdir: /var/lib/.../rocksdb
execution.checkpointing.interval: 900000
execution.checkpointing.timeout: 600000
execution.checkpointing.unaligned: true
execution.checkpointing.mode: EXACTLY_ONCE
execution.checkpointing.max-concurrent-checkpoints: 1
execution.checkpointing.min-pause: 0

您知道异常发生的原因以及如何解决问题吗

---

谢谢

没有现成的支持，可以轻松读取CEP操作员的状态。因此，要实现

KeyedStateReaderFunction

，您必须深入研究CEP实现，找到使用的

ValueState

s和

MapState

s，并实现一个使用相同状态描述符的读卡器。

不能保证状态处理器API能够读取检查点，而且它很有可能不适用于增量检查点。你能用一个保存点来代替吗？在主程序中，我设置了

uid

如下：

CEP.pattern（trafficStream.javaStream，pattern，neweventcomparator[VALUE]{…}.process（new PatternProcessFunction[VALUE，String]{…}.uid（“CEP”）.name（“CEP”）

。当我尝试

chk.readKeyedState（“CEP”），…）

，我得到了由以下原因引起的

：java.lang.IllegalStateException:还原中出现意外的密钥组。