yaooqinn commented on PR #39343:
URL: https://github.com/apache/spark/pull/39343#issuecomment-1372103080
Since 2 different sessions from the same user have their own `sessionUgi`,
does `FileSystem.closeAllForUGI` only close those instances belonging to the
session?
Did a quick test with spark-shell script as follows
```scala
val ugi1 = UserGroupInformation.createRemoteUser("abc")
val fs1 = ugi1.doAs(new PrivilegedExceptionAction[FileSystem]() {
override def run: FileSystem = FileSystem.get(new Configuration)
})
val ugi2 = UserGroupInformation.createRemoteUser("abc")
val fs2 = ugi2.doAs(new PrivilegedExceptionAction[FileSystem]() {
override def run: FileSystem = FileSystem.get(new Configuration)
})
// as ugi1 != ugi2, only fs1 will be closed
FileSystem.closeAllForUGI(ugi1)
val fsNotClosed = ugi2.doAs(new PrivilegedExceptionAction[FileSystem]() {
override def run: FileSystem = FileSystem.get(new Configuration)
})
require(fs2 == fsNotClosed)
val fsRecreated = ugi1.doAs(new PrivilegedExceptionAction[FileSystem]() {
override def run: FileSystem = FileSystem.get(new Configuration)
})
require(fs1 != fsRecreated)
```
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