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Date: Fri, 19 Sep 2014 00:01:59 +0000 (UTC)
From: "Allen Wittenauer (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (HDFS-6808) Add command line option to ask
 DataNode reload configuration.
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    [ https://issues.apache.org/jira/browse/HDFS-6808?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14139765#comment-14139765 ] 

Allen Wittenauer commented on HDFS-6808:
----------------------------------------

{code}
     "\t[-refresh <host:ipc_port> <key> [arg1..argn]\n" +
+    "\t[-reconfig -datanode [start|status] <host:ipc_port>\n" +
{code}

This seems really awkward/confusing vs the other refresh options.

$ hdfs dfsadmin -reconfig -datanode start blah:00000
$ hdfs dfsadmin -reconfig -datanode status blah:00000

Why is it -datanode instead of just datanode?  The "-" implies it is optional.  Are there going to be other daemons that will use the -reconfig syntax?  Should one or more of the various -refresh options be aliased underneath -reconfig?


> Add command line option to ask DataNode reload configuration.
> -------------------------------------------------------------
>
>                 Key: HDFS-6808
>                 URL: https://issues.apache.org/jira/browse/HDFS-6808
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode
>    Affects Versions: 2.5.0
>            Reporter: Lei (Eddy) Xu
>            Assignee: Lei (Eddy) Xu
>         Attachments: HDFS-6808.000.combo.patch, HDFS-6808.000.patch, HDFS-6808.001.combo.patch, HDFS-6808.001.patch, HDFS-6808.002.combo.patch, HDFS-6808.002.patch, HDFS-6808.003.combo.txt, HDFS-6808.003.patch, HDFS-6808.004.combo.patch, HDFS-6808.004.patch, HDFS-6808.005.combo.patch, HDFS-6808.005.patch, HDFS-6808.006.combo.patch, HDFS-6808.006.patch, HDFS-6808.007.combo.patch, HDFS-6808.007.patch, HDFS-6808.008.combo.patch, HDFS-6808.008.patch, HDFS-6808.009.combo.patch, HDFS-6808.009.patch
>
>
> The workflow of dynamically changing data volumes on DataNode is
> # Users manually changed {{dfs.datanode.data.dir}} in the configuration file
> # User use command line to notify DN to reload configuration and updates its volumes. 
> This work adds command line support to notify DN to reload configuration.



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