liuxian created SPARK-22085:
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Summary: When the applicationhas no core left，do not request more
executors from the cluster manager in ExecutorAllocationManager
Key: SPARK-22085
URL: https://issues.apache.org/jira/browse/SPARK-22085
Project: Spark
Issue Type: Improvement
Components: Spark Core
Affects Versions: 2.3.0
Reporter: liuxian
Priority: Minor
When the application has no core left，we should not request more executors
from the cluster manager in `ExecutorAllocationManager`.
At this time, if not reach `spark.dynamicAllocation.maxExecutors`,
`spark.dynamicAllocation.maxExecutors`setting is invalid in fact, so we should
give a warning log.
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