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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-1348) DecommissionManager holds fsnamesystem lock during the whole process of checking if decomissioning DataNodes are finished or not
Date Thu, 19 Aug 2010 22:04:16 GMT
DecommissionManager holds fsnamesystem lock during the whole process of checking if decomissioning
DataNodes are finished or not
--------------------------------------------------------------------------------------------------------------------------------

                 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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