此异常是什么意思？
我正在尝试在HA模式（zookeeper）中部署具有3个节点的flink集群（v.1.5.2）。
我有以下flink-conf.yaml设置：
high-availability: zookeeper
high-availability.storageDir: /flink/ha
high-availability.zookeeper.quorum: {node1_ip}:2181,{node2_ip}:2181,{node3_ip}:2181
high-availability.jobmanager.port: 50010
high-availability.zookeeper.path.root: /flink
high-availability.zookeeper.path.namespace: /default_ns
Zookeeper群集正在运行。 执行start-cluster.sh之后，我只有一个工作节点。另外2个节点返回 {“错误”：[“无法检索当前领导者的重定向地址。请尝试刷新。”]} 从Web UI
和flink-root-standalongsession-.log中的异常：
2018-08-07 18:55:22,081 ERROR org.apache.flink.runtime.rest.handler.legacy.files.StaticFileServerHandler - Could not retrieve the redirect address.
java.util.concurrent.CompletionException: org.apache.flink.runtime.rpc.exceptions.FencingTokenException: Fencing token not set: Ignoring message LocalFencedMessage(aec7a76447f8d44131605f5c10fb4fdc, LocalRpc
...
<------>at org.apache.flink.shaded.netty4.io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:137)
<------>at java.lang.Thread.run(Thread.java:748)
Caused by: org.apache.flink.runtime.rpc.exceptions.FencingTokenException: Fencing token not set: Ignoring message LocalFencedMessage(aec7a76447f8d44131605f5c10fb4fdc, LocalRpcInvocation(requestRestAddress(T
<------>at org.apache.flink.runtime.rpc.akka.FencedAkkaRpcActor.handleRpcMessage(FencedAkkaRpcActor.java:59)