What this exception means? ConnectionManager: key already cancelled ?

Hi, I have a stand alone Spark Cluster, where worker and master reside on the same machine. I submit a job to the cluster, the job is executed for a while and suddenly I get this exception with no additional trace. ConnectionManager: key already cancelled ? sun.nio.ch.SelectionKeyImpl@2490dce9

Re: What this exception means? ConnectionManager: key already cancelled ?

Setting the following while creating the sparkContext will sort it out. .set(spark.core.connection.ack.wait.timeout,600) .set(spark.akka.frameSize,50) On 27 Oct 2014 21:15, shahab shahab.mok...@gmail.com wrote: Hi, I have a stand alone Spark Cluster, where worker and master