Github user ConeyLiu commented on the issue:
https://github.com/apache/spark/pull/17859
It only affect the YARN mode, just see the follow code:
```
OptionAssigner(args.numExecutors, YARN, ALL_DEPLOY_MODES, sysProp =
"spark.executor.instances"),
```
But from now latest code, this parameter affect both `YARN client` & `YARN
cluster`, this change after
[SPARK-9092](https://github.com/apache/spark/pull/7657), but the comment in the
config template didn't make the corresponding changes.
And also, this parameter is set in `spark-env.sh`, so it can only can be
fetched by the method
of `env.get()` according to the class of `SparkSubmitArguments`. However,
now the parameter is set by the follow code:
```
numExecutors = Option(numExecutors)
.getOrElse(sparkProperties.get("spark.executor.instances").orNull)
```
So only you set it in by `--num-executors` or defined the
configure(`spark-default.conf` or `--conf`).
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