Commits on Sep 7, 2024

1. [Fix](hdfs-fs)The cache expiration should explicitly release the held… …

   … fs (apache#38610)
   
   ## Proposed changes
   The RemoteFSPhantomManager class is responsible for managing phantom
   references of RemoteFileSystem objects, ensuring that the associated
   FileSystem resources are automatically cleaned up when RemoteFileSystem
   objects are garbage collected.
   
   Key features:
   
   - Phantom Reference Monitoring: The class uses a ReferenceQueue and
   PhantomReference to track RemoteFileSystem objects. When these objects
   are no longer in use and garbage collected, the class ensures the
   corresponding FileSystem resources are properly closed to prevent
   resource leaks.
   - Thread-safe Cleanup: It provides a thread-safe mechanism to start a
   cleanup thread only once. This thread runs periodically, checking the
   ReferenceQueue and closing any unused FileSystem resources.
   Resource Management: The class maintains a map between phantom
   references and their corresponding FileSystem objects, ensuring that
   these resources are cleaned up appropriately.
   - The cleanup thread runs at regular intervals, ensuring that any
   RemoteFileSystem object that is no longer in use is safely removed along
   with its associated FileSystem resources.
   
   (cherry picked from commit 922ec3a)

   

   CalvinKirs committed Sep 7, 2024
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