有状态结构化 Spark Streaming:未触发超时

Stateful Structured Spark Streaming: Timeout is not getting triggered

我已将超时持续时间设置为“2 分钟”,如下所示:

  def updateAcrossEvents (tuple3: Tuple3[String, String, String], inputs: Iterator[R00tJsonObject],
                          oldState: GroupState[MyState]): OutputRow = {

    println("$$$$ Inside updateAcrossEvents with : " + tuple3._1 + ", " + tuple3._2 + ", " + tuple3._3)
    var state: MyState = if (oldState.exists) oldState.get else MyState(tuple3._1, tuple3._2, tuple3._3)

    if (oldState.hasTimedOut) {
      println("@@@@@ oldState has timed out @@@@")
      // Logic to Write OutputRow
      OutputRow("some values here...")
    } else {
      for (input <- inputs) {
        state = updateWithEvent(state, input)
        oldState.update(state)
        oldState.setTimeoutDuration("2 minutes")
      }
      OutputRow(null, null, null)
    }

  }

我还在 'mapGroupsWithState' 中指定了 ProcessingTimeTimeout 如下...

.mapGroupsWithState(GroupStateTimeout.ProcessingTimeTimeout())(updateAcrossEvents)

但是 'hasTimedOut' 永远不会为真,所以我没有得到任何输出!我做错了什么?

似乎只有在输入数据连续流动时才有效。我已经停止了输入作业,因为我有足够的数据,但似乎只有在连续输入数据时超时才会起作用。不确定为什么要这样设计。使编写 unit/integration 测试变得有点困难,但我确信它以这种方式设计是有原因的。谢谢。