[jira] [Created] (SPARK-21065) Spark Streaming concurrentJobs + StreamingJobProgressListener conflict

["Dan Dutrow (JIRA)" <ji...@apache.org>]

Dan Dutrow created SPARK-21065:
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             Summary: Spark Streaming concurrentJobs + StreamingJobProgressListener conflict
                 Key: SPARK-21065
                 URL: https://issues.apache.org/jira/browse/SPARK-21065
             Project: Spark
          Issue Type: Bug
          Components: Scheduler
    Affects Versions: 2.1.0
            Reporter: Dan Dutrow


My streaming application has 200+ output operations, many of them stateful and several of them windowed. In an attempt to reduce the processing times, I set "spark.streaming.concurrentJobs" to 2+. Initial results are very positive, cutting our processing time from ~3 minutes to ~1 minute, but eventually we encounter an exception as follows:

Note that 1496977560000 ms is 2017-06-09 03:06:00, so it's trying to get a batch from 45 minutes before the exception is thrown.

2017-06-09 03:50:28,259 [Spark Listener Bus] ERROR org.apache.spark.streaming.scheduler.StreamingListenerBus - Listener StreamingJobProgressListener threw an exception
java.util.NoSuchElementException: key not found 1496977560000 ms
at scala.collection.MalLike$class.default(MapLike.scala:228)
at scala.collection.AbstractMap.default(Map.scala:59)
at scala.collection.mutable.HashMap.apply(HashMap.scala:65)
at org.apache.spark.streaming.ui.StreamingJobProgressListener.onOutputOperationCompleted(StreamingJobProgressListener.scala:128)
at org.apache.spark.streaming.scheduler.StreamingListenerBus.doPostEvent(StreamingListenerBus.scala:67)
at org.apache.spark.streaming.scheduler.StreamingListenerBus.doPostEvent(StreamingListenerBus.scala:29)
at org.apache.spark.util.ListenerBus$class.postToAll(ListenerBus.scala:63)
at org.apache.spark.streaming.scheduler.StreamingListenerBus.postToAll(StreamingListenerBus.scala:29)
at org.apache.spark.streaming.scheduler.StreamingListenerBus.onOtherEvent(StreamingListenerBus.scala:43)
...


The Spark code causing the exception is here:

https://github.com/apache/spark/blob/branch-2.1/streaming/src/main/scala/org/apache/spark/streaming/ui/StreamingJobProgressListener.scala#LC125
  override def onOutputOperationCompleted(
      outputOperationCompleted: StreamingListenerOutputOperationCompleted): Unit = synchronized {
    // This method is called before onBatchCompleted
{color:red}runningBatchUIData(outputOperationCompleted.outputOperationInfo.batchTime).{color}
      updateOutputOperationInfo(outputOperationCompleted.outputOperationInfo)
}

It seems to me that it may be caused by that batch being removed earlier.
https://github.com/apache/spark/blob/branch-2.1/streaming/src/main/scala/org/apache/spark/streaming/ui/StreamingJobProgressListener.scala#LC102

  override def onBatchCompleted(batchCompleted: StreamingListenerBatchCompleted): Unit = {
    synchronized {
      waitingBatchUIData.remove(batchCompleted.batchInfo.batchTime)
      {color:red}runningBatchUIData.remove(batchCompleted.batchInfo.batchTime){color}
      val batchUIData = BatchUIData(batchCompleted.batchInfo)
      completedBatchUIData.enqueue(batchUIData)
      if (completedBatchUIData.size > batchUIDataLimit) {
        val removedBatch = completedBatchUIData.dequeue()
        batchTimeToOutputOpIdSparkJobIdPair.remove(removedBatch.batchTime)
      }
      totalCompletedBatches += 1L

      totalProcessedRecords += batchUIData.numRecords
    }
}

What is the solution here? Should I make my spark streaming context remember duration a lot longer? ssc.remember(batchDuration * rememberDuration)

Otherwise, it seems like there should be some kind of existence check on runningBatchUIData before dereferencing it.




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