DecommissionManager holds fsnamesystem lock during the whole process of
checking if decomissioning DataNodes are finished or not
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Key: HDFS-1348
URL: https://issues.apache.org/jira/browse/HDFS-1348
Project: Hadoop HDFS
Issue Type: Improvement
Components: name-node
Reporter: Hairong Kuang
Assignee: Hairong Kuang
Fix For: 0.22.0
NameNode normally is busy all the time. Its log is full of activities every
second. But once for a while, NameNode seems to pause for more than 10 seconds
without doing anything, leaving a blank in its log even though no garbage
collection is happening.
One culprit is DecommionManager. Its monitor holds the fsynamesystem lock
during the whole process of checking if decomissioning DataNodes are finished
or not, during which it checks every block of up to a default of 5 datanodes.
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