[SPARK-29791] Add a spark config to allow user to use executor cores virtually.

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Incomplete
• Affects Version/s: 2.1.0
• Component/s: Scheduler, Spark Core
• Labels: bulk-closed
• Assignee: Unassigned
• Reporter: zengrui
• Created: 07/Nov/19 14:37
• Updated: 25/May/21 01:55
• Resolved: 25/May/21 01:45

Description

We can config the executor cores by "spark.executor.cores". For example, if we config 8 cores for a executor, then the driver can only scheduler 8 tasks to this executor concurrently. In fact, most cases a task does not always occupy a core or more. More time, tasks spent on disk IO or network IO, so we can make driver to scheduler more than 8 tasks(virtual the cores to 16，32 or more the executor report to driver) to this executor concurrently, it will make the whole job execute more quickly.

Issue Links

• links to: GitHub Pull Request #28183