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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:
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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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