Hi there,

I have a cluster of 10 nodes with 12 CPUs each.
This is my configuration:

jobmanager.rpc.port: 6123

jobmanager.heap.mb: 4024

taskmanager.heap.mb: 8096

taskmanager.numberOfTaskSlots: 12

parallelization.degree.default: 120

I have been getting the following error:

java.lang.Exception: Failed to deploy the task Reduce (SUM(1)) (65/120) - execution #0 to slot SimpleSlot (1)(0) - efc370a0b2a9a63f2e7b960cfe4e4c27 - ALLOCATED/ALIVE: java.io.IOException: Insufficient number of network buffers: required 120, but only 2 of 2048 available.
at org.apache.flink.runtime.io.network.buffer.NetworkBufferPool.createBufferPool(NetworkBufferPool.java:155)
at org.apache.flink.runtime.io.network.NetworkEnvironment.registerTask(NetworkEnvironment.java:163)
at org.apache.flink.runtime.taskmanager.TaskManager.org$apache$flink$runtime$taskmanager$TaskManager$$submitTask(TaskManager.scala:426)
at org.apache.flink.runtime.taskmanager.TaskManager$$anonfun$receiveWithLogMessages$1.applyOrElse(TaskManager.scala:261)
at scala.runtime.AbstractPartialFunction$mcVL$sp.apply$mcVL$sp(AbstractPartialFunction.scala:33)
at scala.runtime.AbstractPartialFunction$mcVL$sp.apply(AbstractPartialFunction.scala:33)
at scala.runtime.AbstractPartialFunction$mcVL$sp.apply(AbstractPartialFunction.scala:25)
at org.apache.flink.runtime.ActorLogMessages$$anon$1.apply(ActorLogMessages.scala:37)
at org.apache.flink.runtime.ActorLogMessages$$anon$1.apply(ActorLogMessages.scala:30)
at scala.PartialFunction$class.applyOrElse(PartialFunction.scala:118)
at org.apache.flink.runtime.ActorLogMessages$$anon$1.applyOrElse(ActorLogMessages.scala:30)
at akka.actor.Actor$class.aroundReceive(Actor.scala:465)
at org.apache.flink.runtime.taskmanager.TaskManager.aroundReceive(TaskManager.scala:89)
at akka.actor.ActorCell.receiveMessage(ActorCell.scala:516)
at akka.actor.ActorCell.invoke(ActorCell.scala:487)
at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:254)
at akka.dispatch.Mailbox.run(Mailbox.scala:221)
at akka.dispatch.Mailbox.exec(Mailbox.scala:231)
at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)

at org.apache.flink.runtime.executiongraph.Execution$2.onComplete(Execution.java:344)
at akka.dispatch.OnComplete.internal(Future.scala:247)
at akka.dispatch.OnComplete.internal(Future.scala:244)
at akka.dispatch.japi$CallbackBridge.apply(Future.scala:174)
at akka.dispatch.japi$CallbackBridge.apply(Future.scala:171)
at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:32)
at scala.concurrent.impl.ExecutionContextImpl$$anon$3.exec(ExecutionContextImpl.scala:107)
at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)


I failed to get any info online on how to solve it.
Any help would be welcome.

Thank you!