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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7270) Add congestion signaling capability to DataNode write protocol
Date Mon, 02 Feb 2015 22:23:35 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7270?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14302053#comment-14302053
] 

Arpit Agarwal commented on HDFS-7270:
-------------------------------------

+1 from me on the v002 patch, except I don't think we need the nonce. Network routers use
a nonce since they can't trust either endpoint and cannot maintain state per-stream.

> Add congestion signaling capability to DataNode write protocol
> --------------------------------------------------------------
>
>                 Key: HDFS-7270
>                 URL: https://issues.apache.org/jira/browse/HDFS-7270
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode
>            Reporter: Haohui Mai
>            Assignee: Haohui Mai
>         Attachments: HDFS-7270.000.patch, HDFS-7270.001.patch, HDFS-7270.002.patch
>
>
> When a client writes to HDFS faster than the disk bandwidth of the DNs, it  saturates
the disk bandwidth and put the DNs unresponsive. The client only backs off by aborting / recovering
the pipeline, which leads to failed writes and unnecessary pipeline recovery.
> This jira proposes to add explicit congestion control mechanisms in the writing pipeline.




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