each DFSClient instance uses a daemon thread for lease checking, there should
be a singleton daemon for all DFSClient instances
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Key: HDFS-1131
URL: https://issues.apache.org/jira/browse/HDFS-1131
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: Alejandro Abdelnur
Priority: Critical
When accessing HDFS from a server application that acts on behalf of several
users each user has its own file system handle (DFSClient), this creates one
daemon thread per file system instance.
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