gengliangwang commented on pull request #34092:
URL: https://github.com/apache/spark/pull/34092#issuecomment-926422744
@mridulm Yes.
At first the benchmark of job start:
```
listener.onJobStart(SparkListenerJobStart(4, time, stages, null))
```
Later on, I change the stage info inside to `Nil`
```
listener.onJobStart(SparkListenerJobStart(4, time, Nil, null))
```
and the difference for LevelDB is
before changes: 2.5s
after changes: 3s
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