Use named daemon threads for the directory scanner
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Key: HDFS-2607
URL: https://issues.apache.org/jira/browse/HDFS-2607
Project: Hadoop HDFS
Issue Type: Improvement
Affects Versions: 0.23.0, 0.21.0, 0.22.0
Reporter: Eli Collins
Fix For: 0.23.1
HDFS-854 added a thread pool for block scanners. It would be better to use a
factory that names the threads and daemonizes them so they don't block shutdown.
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