Why does the oozie launcher consume 2 yarn containers?
问题 I am using Oozie to execute a spark job. I "kind-of" understand that oozie lunches a map-only mapreduce job and from there lunches the spark-job. What I do not understand is why this job consumes 2 yarn-containers? In Yarn's resource manager page (titled "All Applications") I see something like this: ID: application_nnnnn_3456 Name: oozie: launcher... Application Type: MAPREDUCE Running Containers: 2 ID: application_nnnnn_3457 Name: spark-app Application Type: SPARK Running Containers: 1 Is