zhaomin1423 commented on PR #43439:
URL: https://github.com/apache/spark/pull/43439#issuecomment-1777490785
> > What I am confused about is, how should we check the effect after gc is
triggered
>
> Construct a case where `SparkResult` won't be manually closed, and check
if after registering `cleanable`, `Cleaner.impl.phantomCleanableList` is not
empty, but eventually `phantomCleanableList` is empty? This may require adding
some code to get `phantomCleanableList` through reflection, just a suggestion,
not sure if it's really feasible.
can't get Cleaner.impl by reflect, there is an exception.
```
Exception in thread "main" java.lang.reflect.InaccessibleObjectException:
Unable to make field final jdk.internal.ref.CleanerImpl
java.lang.ref.Cleaner.impl accessible: module java.base does not "opens
java.lang.ref" to unnamed module @2f92e0f4
at
java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:354)
at
java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297)
at
java.base/java.lang.reflect.Field.checkCanSetAccessible(Field.java:178)
at java.base/java.lang.reflect.Field.setAccessible(Field.java:172)
```
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