胡振宇 created SPARK-36584:
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Summary: ExecutorMonitor#onBlockUpdated will receive event from
driver
Key: SPARK-36584
URL: https://issues.apache.org/jira/browse/SPARK-36584
Project: Spark
Issue Type: Bug
Components: Spark Core
Affects Versions: 3.1.2
Environment: Spark 3.1.2
Reporter: 胡振宇
When driver broadcast object, it will send the
[SparkListenerBlockUpdated](https://github.com/apache/spark/blob/df0ec56723f0b47c3629055fa7a8c63bb4285147/core/src/main/scala/org/apache/spark/scheduler/SparkListener.scala#L228)
event.
[ExecutorMonitor#onBlockUpdated](https://github.com/apache/spark/blob/df0ec56723f0b47c3629055fa7a8c63bb4285147/core/src/main/scala/org/apache/spark/scheduler/dynalloc/ExecutorMonitor.scala#L380)
receives and handles the event, in this method, it calls
[ensureExecutorIsTracked](https://github.com/apache/spark/blob/df0ec56723f0b47c3629055fa7a8c63bb4285147/core/src/main/scala/org/apache/spark/scheduler/dynalloc/ExecutorMonitor.scala#L489)
to put driver in `executors` variable, but in my understanding,
`ExecutorMonitor` should only monitor Executor, not Driver. Moreover, adding a
`driver` to the `executors` will affect the calculation of
[ExecutorAllocationManager#removeExecutors](https://github.com/apache/spark/blob/df0ec56723f0b47c3629055fa7a8c63bb4285147/core/src/main/scala/org/apache/spark/ExecutorAllocationManager.scala#L552),
and the driver will occupy the count of `executors`
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