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From "Ming Ma (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8009) Signal congestion on the DataNode
Date Mon, 13 Apr 2015 15:35:14 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8009?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14492523#comment-14492523
] 

Ming Ma commented on HDFS-8009:
-------------------------------

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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