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https://issues.apache.org/jira/browse/HDFS-8009?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14492523#comment-14492523
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Ming Ma commented on HDFS-8009:
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This overall DN congestion functionality seem useful.
* System load is a useful metrics. But I wonder if we plan to take fairness
into account. e.g., DN will ask only the heavy users to back off.
* Support for read operation. Sometimes DNs could become the hotspot due to
some applications reading specific blocks and cause high NIC bandwidth
utilization.
> Signal congestion on the DataNode
> ---------------------------------
>
> Key: HDFS-8009
> URL: https://issues.apache.org/jira/browse/HDFS-8009
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: datanode
> Reporter: Haohui Mai
> Assignee: Haohui Mai
> Fix For: 2.8.0
>
> Attachments: HDFS-8009.000.patch
>
>
> The DataNode should signal congestion (i.e. "I'm too busy") in the
> PipelineAck using the mechanism introduced in HDFS-7270.
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