zengrui created SPARK-29791:
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Summary: Add a spark config to allow user to use executor cores
virtually.
Key: SPARK-29791
URL: https://issues.apache.org/jira/browse/SPARK-29791
Project: Spark
Issue Type: Improvement
Components: Scheduler
Affects Versions: 2.1.0
Reporter: zengrui
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 to this executor concurrently, it will
make the whole job execute more quickly.
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