[jira] [Created] (HDFS-3047) DU usage in FSDataset should use a single thread, instead of thread per directory

["Suresh Srinivas (Created) (JIRA)" <ji...@apache.org>]

DU usage in FSDataset should use a single thread, instead of thread per directory
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                 Key: HDFS-3047
                 URL: https://issues.apache.org/jira/browse/HDFS-3047
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: data-node, tools
    Affects Versions: 0.24.0
            Reporter: Suresh Srinivas


Currently there is a DU thread per volume and with federation a thread per block pool per volume that tracks the DFS used space. In a large installs the number of threads started = Number of FSVolumes * Number of block pools. This results unnecessarily huge number of threads.

I propose a single thread which performs DU for a set of directories.


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