rmatharu opened a new pull request #923: Adding a bound on EventHubSystemConsumer's initalizeEventHubsManagers URL: https://github.com/apache/samza/pull/923 Being a sync call, eventHubManagers can cause the container-start or the runLoop to block. Like so, "Samza StreamProcessor Container Thread-0" #340 daemon prio=5 os_prio=0 tid=0x00007f5e38427800 nid=0x579e waiting on condition [0x00007f5e888cc000] java.lang.Thread.State: WAITING (parking) at sun.misc.Unsafe.park(Native Method) - parking to wait for <0x00000005c1e04bf0> (a java.util.concurrent.CompletableFuture$Signaller) at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175) at java.util.concurrent.CompletableFuture$Signaller.block(CompletableFuture.java:1693) at java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3323) at java.util.concurrent.CompletableFuture.waitingGet(CompletableFuture.java:1729) at java.util.concurrent.CompletableFuture.get(CompletableFuture.java:1895) at com.microsoft.azure.eventhubs.EventHubClient.lambda$createReceiverSync$7(EventHubClient.java:336) at com.microsoft.azure.eventhubs.EventHubClient$$Lambda$371/65833266.execute(Unknown Source) at com.microsoft.azure.eventhubs.impl.ExceptionUtil.sync(ExceptionUtil.java:191) at com.microsoft.azure.eventhubs.EventHubClient.createReceiverSync(EventHubClient.java:336) at org.apache.samza.system.eventhub.consumer.EventHubSystemConsumer.initializeEventHubsManagers(EventHubSystemConsumer.java:320) - locked <0x00000005c1e04cd0> (a com.linkedin.samza.eventhub.consumer.LiEventHubSystemConsumer) at org.apache.samza.system.eventhub.consumer.EventHubSystemConsumer.start(EventHubSystemConsumer.java:355) at org.apache.samza.system.SystemConsumers$$anonfun$start$5.apply(SystemConsumers.scala:168) at org.apache.samza.system.SystemConsumers$$anonfun$start$5.apply(SystemConsumers.scala:168) at scala.collection.Iterator$class.foreach(Iterator.scala:727) at scala.collection.AbstractIterator.foreach(Iterator.scala:1157) at scala.collection.MapLike$DefaultValuesIterable.foreach(MapLike.scala:206) at org.apache.samza.system.SystemConsumers.start(SystemConsumers.scala:168) at org.apache.samza.container.SamzaContainer.startConsumers(SamzaContainer.scala:999) at org.apache.samza.container.SamzaContainer.run(SamzaContainer.scala:779) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) This PR introduces a bound on it.
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