HDFS-1840. In DFSClient, terminate the lease renewing thread when all files being written are closed for a grace period, and start a new thread when new files are opened for write.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/hdfs/trunk@1095461 13f79535-47bb-0310-9956-ffa450edef68
3 files changed