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From "Andrew Wang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-11941) Move dfsadmin triggerBlockReport and metaSave to debugadmin
Date Wed, 07 Jun 2017 07:03:19 GMT
Andrew Wang created HDFS-11941:

             Summary: Move dfsadmin triggerBlockReport and metaSave to debugadmin
                 Key: HDFS-11941
                 URL: https://issues.apache.org/jira/browse/HDFS-11941
             Project: Hadoop HDFS
          Issue Type: Improvement
    Affects Versions: 2.9.0, 3.0.0-alpha4
            Reporter: Andrew Wang

Filing a JIRA for discussion. While reviewing the [dfsadmin commands|https://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-hdfs/HDFSCommands.html#dfsadmin]
some of them seem better suited for debugadmin:

* triggerBlockReport: similar to recoverLease in debugadmin, you don't need this unless HDFS
is in a bad state
* metasave: dumps NN datastructures to a side file. Seems purely for debugging.

DebugAdmin commands notably do not need to be compatible between releases and do not have
Java API equivalents in HdfsAdmin.

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