Walter Su created HDFS-8896:
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Summary: DataNode object isn't GCed when shutdown, because it has
GC root in ShutdownHookManager
Key: HDFS-8896
URL: https://issues.apache.org/jira/browse/HDFS-8896
Project: Hadoop HDFS
Issue Type: Bug
Components: test
Reporter: Walter Su
Assignee: Walter Su
Priority: Minor
The anonymous {{Thread}} object created in {{ShutdownHookManager}} is a GC root.
screenshot_1 shows how DN object be traced to the GC root.
It's not a problem in production.
It's a problem in test, especially when MiniDFSCluster starts/shutdowns many
DNs, which could cause {{OutOfMemoryError}}.
screenshot_2 shows many DN objects are not GCed when run the test of HDFS-8838.
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