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