Apache flink Flink任务管理器超时？

我正在运行一个Flink应用程序（通过Thread），任务管理器有时会随机超时，错误如下：

java.util.concurrent.TimeoutException: Heartbeat of TaskManager with id someId timed out.
    at org.apache.flink.runtime.jobmaster.JobMaster$TaskManagerHeartbeatListener.notifyHeartbeatTimeout(JobMaster.java:1610)
    at org.apache.flink.runtime.heartbeat.HeartbeatManagerImpl$HeartbeatMonitor.run(HeartbeatManagerImpl.java:339)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at org.apache.flink.runtime.concurrent.akka.ActorSystemScheduledExecutorAdapter$ScheduledFutureTask.run(ActorSystemScheduledExecutorAdapter.java:154)
    at akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:39)
    at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:415)
    at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
    at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
    at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
    at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)

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这发生在作业开始运行后30-45分钟。你知道是什么导致了这一切吗

此问题的原因可能是JobManager的内存太小，请尝试将其变大

任务管理器的日志看起来如何？任务管理器真的死了吗？或者他正处于繁重的负载下？我们如何做到这一点？在文件

flink-conf.yaml

中使用参数

jobmanager.heap.size