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CommunityData:Hyak Spark
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=== Errors While Starting Cluster === Sometimes I get errors like this: n0650: failed to launch: nice -n 0 /com/local/spark/bin/spark-class org.apache.spark.deploy.worker.Worker --webui-port 8081 spark://n0649:18899 Usually it seems to happen if I relinquish my spark cluster (whether I use the kill script or not) and then immediately restart one. The error goes away if I shut down and wait a minute or two before re-launching; my assumption is that there's some hygienic work being done behind the scenes that the scheduler doesn't know about and I need to let that finish. And sometimes I get errors like this: scontrol: error: host list is empty when trying to launch spark. This means I'm in a session that doesn't know what nodes are assigned to the spark cluster. This will launch a dysfunctional cluster. Stop-all and then start_spark_cluster from the same session you landed in when you ran get_spark_nodes. When I get errors about full logs, I go in and clean up the temporary files folder it refers to.
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