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https://issues.apache.org/jira/browse/HDFS-12859?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16266814#comment-16266814
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Jianfei Jiang commented on HDFS-12859:
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Thanks [~brahmareddy], HDFS-9375 actually resolve the issue to set bandwidth
for specific node perfectly and I have some same idea with him. It can be used
to reset the bandwidth in memory with the value in configuration as well.
However, HDFS-9375 focus on "SET" and I focus on "RESET". I want to synchronize
bandwidth with the permanent value in the configuration file automatically.
The value set by setBalancerBandwidth is sometimes temporary (scheduled task at
low-load time or other use). If we have hundreds of datanodes and have various
value in their hdfs-site.xml, it may be a little difficult to set the value
back. So I thinks this new command would be useful in some occasions.
> Admin command resetBalancerBandwidth
> ------------------------------------
>
> Key: HDFS-12859
> URL: https://issues.apache.org/jira/browse/HDFS-12859
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: balancer & mover
> Affects Versions: 3.0.0-beta1
> Reporter: Jianfei Jiang
> Fix For: 3.1.0
>
> Attachments: HDFS-12859.patch
>
>
> We can already set balancer bandwidth dynamically using command
> setBalancerBandwidth. The setting value is not persistent and not stored in
> configuration file. The different datanodes could their different default or
> former setting in configuration.
> When we suggested to develop a schedule balancer task which runs at midnight
> everyday. We set a larger bandwidth for it and hope to reset the value after
> finishing. However, we found it difficult to reset the different setting for
> different datanodes as the setBalancerBandwidth command can only set the same
> value to all datanodes. If we want to use unique setting for every datanode,
> we have to reset the datanodes.
> So it would be useful to have a command to synchronize the setting with the
> configuration file.
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