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Posted to hdfs-dev@hadoop.apache.org by "Colin Patrick McCabe (JIRA)" <ji...@apache.org> on 2015/08/28 22:28:46 UTC

[jira] [Created] (HDFS-8989) Allow rate-limiting the DirectoryScanner via time-slicing

Colin Patrick McCabe created HDFS-8989:
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             Summary: Allow rate-limiting the DirectoryScanner via time-slicing
                 Key: HDFS-8989
                 URL: https://issues.apache.org/jira/browse/HDFS-8989
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: datanode
    Affects Versions: 2.0.6-alpha
            Reporter: Colin Patrick McCabe
            Assignee: Daniel Templeton


When the inodes and directory entries for HDFS block and meta files are not in the cache, the DirectoryScanner can create enormous disk load via generating many seeks.  This can effectively make the disks unusable for other purposes.  We should allow rate-limiting the DirectoryScanner via time-slicing, so that it only runs every 100 ms out of 1 s (or whatever other percentage we configure.)



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