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https://issues.apache.org/jira/browse/HDFS-2964?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14380796#comment-14380796
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Hadoop QA commented on HDFS-2964:
---------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest 
attachment 
  http://issues.apache.org/jira/secure/attachment/12707253/HDFS-2964-3.patch
  against trunk revision c906a1d.

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

    {color:red}-1 tests included{color}.  The patch doesn't appear to include 
any new or modified tests.
                        Please justify why no new tests are needed for this 
patch.
                        Also please list what manual steps were performed to 
verify this patch.

    {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 2.0.3) 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-hdfs-project/hadoop-hdfs:

                  org.apache.hadoop.tracing.TestTracing

Test results: 
https://builds.apache.org/job/PreCommit-HDFS-Build/10066//testReport/
Console output: 
https://builds.apache.org/job/PreCommit-HDFS-Build/10066//console

This message is automatically generated.

> No notice in any logs if dfs.datanode.du.reserved is greater than available 
> disk space
> --------------------------------------------------------------------------------------
>
>                 Key: HDFS-2964
>                 URL: https://issues.apache.org/jira/browse/HDFS-2964
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: datanode
>    Affects Versions: 2.6.0
>            Reporter: Robert J Berger
>            Priority: Minor
>         Attachments: HDFS-2964-1.patch, HDFS-2964-2.patch, HDFS-2964-3.patch, 
> HDFS-2964.patch
>
>
> We spent a long time tracking down why a test hdfs cluster seemed to be 
> running fine, but would not allow the mapred system to come up complaining 
> that "could only be replicated to 0 nodes, instead of 1".
> There were no namenode or datanode errors in any of the logs. hadoop fsck 
> said everything was good. At first glance dfsadmin -report looked good. It 
> wasn't until I realized that there was 0 Capacity available that we poked 
> around and found 
> https://groups.google.com/a/cloudera.org/group/scm-users/msg/a4252d6623adbc2d 
> which mentioned that the "reserverd space" might be greater than the disk 
> space available. And we did find that our dfs.datanode.du.reserved was indeed 
> higher than our actual since we were only testing a small cluster.
> It seems that there should be some warning or error in the logs that say that.



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