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HDFS-17785. DFSAdmin supports setting the bandwidth for DataNode. #7705
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We should update this by datanode ,not by NameNode.
| We're closing this stale PR because it has been open for 100 days with no activity. This isn't a judgement on the merit of the PR in any way. It's just a way of keeping the PR queue manageable. | 
Currently, bandwidth can only be configured for individual DataNodes through the reconfig command. It is expected that bandwidth settings for all DataNodes could be managed centrally via dfsadmin.
hdfs dfsadmin -setDataNodeBandwidth 100000000 -type <transfer|write|read>