Kihwal Lee created HDFS-3646:
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Summary: LeaseRenewer can hold reference to inactive DFSClient
instances
Key: HDFS-3646
URL: https://issues.apache.org/jira/browse/HDFS-3646
Project: Hadoop HDFS
Issue Type: Bug
Components: hdfs client
Affects Versions: 2.0.0-alpha, 0.23.3
Reporter: Kihwal Lee
Assignee: Kihwal Lee
Priority: Critical
Fix For: 0.23.3, 2.0.1-alpha, 3.0.0
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.
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