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From "Yiqun Lin (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-11350) Document the missing settings relevant to DataNode disk IO statistics
Date Thu, 19 Jan 2017 11:41:26 GMT
Yiqun Lin created HDFS-11350:
--------------------------------

             Summary: Document the missing settings relevant to DataNode disk IO statistics
                 Key: HDFS-11350
                 URL: https://issues.apache.org/jira/browse/HDFS-11350
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: documentation
    Affects Versions: 3.0.0-alpha2
            Reporter: Yiqun Lin
            Assignee: Yiqun Lin
            Priority: Minor


HDFS-11299 and HDFS-11339 introduced some new setting relevant to  profiling hooks to expose
latency statistics around DataNode disk IO. These settings should be intended for users but
they are not documented. Totally three relevant settings:

1.dfs.datanode.enable.fileio.profiling
2.dfs.datanode.enable.fileio.fault.injection
3.dfs.datanode.fileio.profiling.sampling.fraction

Actually, only the setting {{dfs.datanode.enable.fileio.fault.injection}} don't need to be
documented.



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