Github user dragos commented on the pull request:
https://github.com/apache/spark/pull/3844#issuecomment-71852913
There also seems to be a race condition introduced by this test. It fails
consistently for me (but passes if I add a `Thread.sleep(50)` inside
`publishData`). I'll open a ticket.
```
[info] - mqtt input stream *** FAILED *** (552 milliseconds)
[info] org.eclipse.paho.client.mqttv3.MqttException: Too many publishes
in progress
[info] at
org.eclipse.paho.client.mqttv3.internal.ClientState.send(ClientState.java:432)
[info] at
org.eclipse.paho.client.mqttv3.internal.ClientComms.internalSend(ClientComms.java:121)
[info] at
org.eclipse.paho.client.mqttv3.internal.ClientComms.sendNoWait(ClientComms.java:139)
[info] at
org.eclipse.paho.client.mqttv3.MqttTopic.publish(MqttTopic.java:107)
[info] at
org.apache.spark.streaming.mqtt.MQTTStreamSuite$$anonfun$publishData$1.apply(MQTTStreamSuite.scala:126)
[info] at
org.apache.spark.streaming.mqtt.MQTTStreamSuite$$anonfun$publishData$1.apply(MQTTStreamSuite.scala:124)
[info] at scala.collection.immutable.Range.foreach(Range.scala:141)
[info] at
org.apache.spark.streaming.mqtt.MQTTStreamSuite.publishData(MQTTStreamSuite.scala:124)
[info] at
org.apache.spark.streaming.mqtt.MQTTStreamSuite$$anonfun$3.apply$mcV$sp(MQTTStreamSuite.scala:78)
[info] at
org.apache.spark.streaming.mqtt.MQTTStreamSuite$$anonfun$3.apply(MQTTStreamSuite.scala:66)
[info] at
org.apache.spark.streaming.mqtt.MQTTStreamSuite$$anonfun$3.apply(MQTTStreamSuite.scala:66)
[info] at
org.scalatest.Transformer$$anonfun$apply$1.apply$mcV$sp(Transformer.scala:22)
[info] at org.scalatest.OutcomeOf$class.outcomeOf(OutcomeOf.scala:85)
[info] at org.scalatest.OutcomeOf$.outcomeOf(OutcomeOf.scala:104)
[info] at org.scalatest.Transformer.apply(Transformer.scala:22)
[info] at org.scalatest.Transformer.apply(Transformer.scala:20)
[info] at org.scalatest.FunSuiteLike$$anon$1.apply(FunSuiteLike.scala:166)
[info] at org.scalatest.Suite$class.withFixture(Suite.scala:1122)
```
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