Lei Yang created HDFS-16518:
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Summary: KeyProviderCache does not get closed in
ShutdownHookManager
Key: HDFS-16518
URL: https://issues.apache.org/jira/browse/HDFS-16518
Project: Hadoop HDFS
Issue Type: Bug
Components: hdfs
Affects Versions: 2.10.0
Reporter: Lei Yang
The cache has ttl and can close KeyProvider when cache entry is expired.
In KeyProviderCache, we should add ShutdownHookManager to clean up all
keyprovider instances in the cache when jvm shuts down.
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