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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6808) Add command line option to ask DataNode reload configuration.
Date Wed, 27 Jan 2016 19:45:40 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6808?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15120054#comment-15120054
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Arpit Agarwal commented on HDFS-6808:
-------------------------------------

Hi Xiaobing, we can continue the discussion on HDFS-7035 since [~eddyxu] responded there.

bq. I think the inconsistency between ReconfigurableBase#reconfigureProperty and ReconfigurationThread#run
should be handled in ReconfigurationThread#run by adding the snippet as the following:
This makes the behavior consistent but does not allow handling situations where the effective
value is different from the old and new values, like for the changed volumes. Lei had a good
suggestion to have reconfigurePropertyImpl return the new effective value.

> 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
>             Fix For: 2.6.0
>
>         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, HDFS-6808.010.patch, HDFS-6808.011.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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