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From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5175) Provide clients a way to set IP header bits on connections
Date Fri, 24 Oct 2014 18:29:34 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5175?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14183233#comment-14183233

Chris Nauroth commented on HDFS-5175:

Yes, you're right.  I mistakenly looked at the old httpclient dependency that we're going
to remove.

Then, if I understand correctly, we have this dependency now...


...and in addition, you're proposing that we add this dependency:


Do I have it correct now?

It's possible I'm exaggerating the impact of adding this dependency, so it would be great
to get more opinions.  An email to hdfs-dev would be a good way to call attention to it.

> Provide clients a way to set IP header bits on connections
> ----------------------------------------------------------
>                 Key: HDFS-5175
>                 URL: https://issues.apache.org/jira/browse/HDFS-5175
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.0.5-alpha
>            Reporter: Lohit Vijayarenu
> It would be very helpful if we had ability for clients to set IP headers when they make
socket connections for data transfers. We were looking into setting up QoS using DSCP bit
and saw that there is no easy way to let clients pass down a specific value when clients make
connection to DataNode.
> As a quick fix we did something similar to io.file.buffer.size where client could pass
down DSCP integer value and when DFSClient opens a stream, it could set the value on socket
using setTrafficClass
> Opening this JIRA to get more inputs from others who have had experience and might have
already thought about this. 

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