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Posted to hdfs-dev@hadoop.apache.org by "Hairong Kuang (JIRA)" <ji...@apache.org> on 2010/08/20 00:04:16 UTC

[jira] Created: (HDFS-1348) DecommissionManager holds fsnamesystem lock during the whole process of checking if decomissioning DataNodes are finished or not

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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