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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9468) DfsAdmin command set dataXceiver count for datanode
Date Tue, 01 Dec 2015 14:15:10 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9468?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15033729#comment-15033729
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Kihwal Lee commented on HDFS-9468:
----------------------------------

It is better to have a persisted source of truth. It can be very confusing, if the content
of config file does not reflect the runtime. HDFS-6727 is related. HDFS-7519 might also give
you the context and what some people wanted to accomplish. We could have a generic refresh
command or an individual commands for specific purposes. That's a design decision we have
to make.

> DfsAdmin command set dataXceiver count for datanode
> ---------------------------------------------------
>
>                 Key: HDFS-9468
>                 URL: https://issues.apache.org/jira/browse/HDFS-9468
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode
>    Affects Versions: 2.7.1
>            Reporter: Lin Yiqun
>            Assignee: Lin Yiqun
>         Attachments: HDFS-9468.001.patch
>
>
> Now in every datanode,concurrent xceivers count value are all set by {{DFSConfigKeys.DFS_DATANODE_MAX_RECEIVER_THREADS_DEFAULT}}.And
if you want to set this value for different values because some node has lower memory or cores.Then
you must to change the config and restart datanode.So may be we can dynamic set dataxceiver
count by a dfsadmin command and we can set value for one or many specific nodes.



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