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https://issues.apache.org/jira/browse/HDFS-5274?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13909065#comment-13909065
 ] 

Hadoop QA commented on HDFS-5274:
---------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest 
attachment 
  http://issues.apache.org/jira/secure/attachment/12630393/HDFS-5274-8.patch
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author 
tags.

    {color:green}+1 tests included{color}.  The patch appears to include 4 new 
or modified test files.

    {color:green}+1 javac{color}.  The applied patch does not increase the 
total number of javac compiler warnings.

    {color:green}+1 javadoc{color}.  There were no new javadoc warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with 
eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new 
Findbugs (version 1.3.9) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase 
the total number of release audit warnings.

    {color:red}-1 core tests{color}.  The patch failed these unit tests in 
hadoop-common-project/hadoop-common hadoop-hdfs-project/hadoop-hdfs:

                  org.apache.hadoop.hdfs.web.TestWebHDFS

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: 
https://builds.apache.org/job/PreCommit-HDFS-Build/6208//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/6208//console

This message is automatically generated.

> 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, HDFS-5274-8.patch, HDFS-5274-8.patch, Zipkin   Trace 
> a06e941b0172ec73.png, Zipkin   Trace d0f0d66b8a258a69.png, ss-5274v8-get.png, 
> ss-5274v8-put.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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