[HDFS-3646] LeaseRenewer can hold reference to inactive DFSClient instances forever

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 0.23.3, 2.0.0-alpha
• Fix Version/s: 0.23.3, 2.0.2-alpha
• Component/s: hdfs-client
• Target Version/s: 0.23.3, 2.0.2-alpha
• Hadoop Flags: Reviewed
• Assignee: Kihwal Lee
• Reporter: Kihwal Lee
• Created: 12/Jul/12 13:43
• Updated: 11/Oct/12 17:46
• Resolved: 19/Jul/12 15:13

Description

If LeaseRenewer#closeClient() is not called, LeaseRenewer keeps the reference to a DFSClient instance in dfsclients forever. This prevents DFSClient, LeaseRenewer, conf, etc. from being garbage collected, leading to memory leak.

LeaseRenewer should remove the reference after some delay, if a DFSClient instance no longer has active streams.