MrHappyEnding opened a new pull request, #58110:
URL: https://github.com/apache/spark/pull/58110
### What changes were proposed in this pull request?
Close FileSystem instances cached for the fresh Hadoop UGI after obtaining
delegation tokens. The cleanup is shared by both one-time token acquisition and
scheduled renewal, and runs in a `finally` block.
A regression test was added to verify that FileSystem instances created
during renewal are closed.
### Why are the changes needed?
Each renewal creates a fresh UGI. FileSystem instances cached for that UGI
were not closed by the renewal path, causing the Hadoop FileSystem cache to
grow after every renewal.
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
Ran:
build/sbt 'core/testOnly *HadoopDelegationTokenManagerSuite -- -z
"SPARK-58438"'
build/sbt 'core/testOnly *HadoopDelegationTokenManagerSuite'
dev/lint-scala
### Was this patch authored or co-authored using generative AI tooling?
Generated-by: Codex
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