Github user Bilna commented on a diff in the pull request:
https://github.com/apache/spark/pull/4270#discussion_r23828884
--- Diff:
external/mqtt/src/test/scala/org/apache/spark/streaming/mqtt/MQTTStreamSuite.scala
---
@@ -121,8 +130,18 @@ class MQTTStreamSuite extends FunSuite with Eventually
with BeforeAndAfter {
val message: MqttMessage = new MqttMessage(data.getBytes("utf-8"))
message.setQos(1)
message.setRetained(true)
+
+ def tryPublish(times: Int): Unit =
+ if (times > 0) try {
+ msgTopic.publish(message)
+ } catch {
+ case e: MqttException if e.getReasonCode ==
MqttException.REASON_CODE_MAX_INFLIGHT =>
+ Thread.sleep(50) // wait for Spark streaming to consume
something from the message queue
+ tryPublish(times - 1)
+ }
+
for (i <- 0 to 100) {
- msgTopic.publish(message)
+ tryPublish(3)
--- End diff --
I think waitForReceiverToStart() method is sufficient. Once the receiver is
started, since the qos is set to 1 , as soon as the receiver receives the
message, message will be flushed out from queue. If still problem exists the
Thread.Sleep in the catch can solve the problem.
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