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From "Haohui Mai (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8009) Signal congestion on the DataNode
Date Mon, 13 Apr 2015 18:50:15 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8009?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14492836#comment-14492836

Haohui Mai commented on HDFS-8009:

Both are very good suggestions.

I believe that in the longer term signaling congestion can be pluggable as the definition
of load and congestion varies in different deployment.

For fairness and read I think it requires a somewhat more generalized design to address both
(1) prioritizing I/O operations and (2) QoS for different users. We can address it in a separate

> 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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