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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5274) Add Tracing to HDFS
Date Fri, 21 Feb 2014 00:47:24 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5274?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13907800#comment-13907800
] 

Todd Lipcon commented on HDFS-5274:
-----------------------------------

Hi Suresh. As one of the primary authors of HTrace I'd say that there are no plans to put
it in Hadoop Common. Personally I think Hadoop Common as a grab-bag of all things Hadoop gets
pretty messy, since it's harder to piece-meal upgrade different components. It also means
that dependent apps like HBase would need to wait on new versions of Common and have even
more difficulty building the same code against different versions of Hadoop.

Happy to take contributions to HTrace via github pull request if you like, though.

> Add Tracing to HDFS
> -------------------
>
>                 Key: HDFS-5274
>                 URL: https://issues.apache.org/jira/browse/HDFS-5274
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: datanode, namenode
>    Affects Versions: 2.1.1-beta
>            Reporter: Elliott Clark
>            Assignee: Elliott Clark
>         Attachments: HDFS-5274-0.patch, HDFS-5274-1.patch, HDFS-5274-2.patch, HDFS-5274-3.patch,
HDFS-5274-4.patch, HDFS-5274-5.patch, HDFS-5274-6.patch, HDFS-5274-7.patch, Zipkin   Trace
a06e941b0172ec73.png, Zipkin   Trace d0f0d66b8a258a69.png
>
>
> Since Google's Dapper paper has shown the benefits of tracing for a large distributed
system, it seems like a good time to add tracing to HDFS.  HBase has added tracing using HTrace.
 I propose that the same can be done within HDFS.



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