[MRQL-73] Set the max number of tasks in Spark mode

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 0.9.6
• Component/s: Run-Time/Spark
• Assignee: Leonidas Fegaras
• Reporter: Leonidas Fegaras
• Created: 24/May/15 21:14
• Updated: 25/May/15 12:53
• Resolved: 25/May/15 12:53

Description

The number of worker nodes in Spark distributed mode, which are specified by the MRQL -nodes parameter, must set the parameters SPARK_WORKER_INSTANCES (called SPARK_EXECUTOR_INSTANCES in Spark 1.3.*) and SPARK_WORKER_CORES; otherwise, Spark will always use all the available cores in the cluster.