liangyongyuan created SPARK-44179:
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Summary: When a task failed and the inferred task for that task is
still executing, the number of dynamically scheduled executors will be
calculated incorrectly
Key: SPARK-44179
URL: https://issues.apache.org/jira/browse/SPARK-44179
Project: Spark
Issue Type: Improvement
Components: Spark Core
Affects Versions: 3.4.1
Reporter: liangyongyuan
Assuming a stage has Task 1, with Task 1.0 and a speculative task Task 1.1
running concurrently, the dynamic scheduler calculates the number of executors
as 2 (pendingTask: 0, pendingSpeculative: 0, running: 2).
At this point, Task 1.0 fails, and the dynamic scheduler recalculates the
number of executors as 2 (pendingTask: 1, pendingSpeculative: 0, running: 1).
Due to the failure of Task 1.0, copyRunning(1) becomes 1. As a result, Task 1
is speculated again and a SparkListenerSpeculativeTaskSubmitted event is
triggered. However, the dynamic scheduler's calculation for the number of
executors becomes 3 (pendingTask: 1, pendingSpeculative: 1, running: 1), which
is obviously not as expected.
Then, Task 1.2 starts, and it is marked as a speculative task. However, the
dynamic scheduler still calculates the number of executors as 3 (pendingTask:
1, pendingSpeculative: 1, running: 1), which again is not as expected.
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