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My spark job is utilising all V cores configured for Yarn queue: New jobs failing

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My Yarn queue has total vcores configured as150 and memory of 850 gb.My spark job is utilising all the V cores available which is 150, but only 1/3rd of total memory is currently utilised: however when new jobs are started they are failing  with message - unable to allocate yarn resources.

how can I reduce my vcores allocation for spark job.

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