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https://issues.apache.org/jira/browse/HDFS-4916?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13688858#comment-13688858
 ] 

Hadoop QA commented on HDFS-4916:
---------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest 
attachment 
  http://issues.apache.org/jira/secure/attachment/12588510/4916.v0.patch
  against trunk revision .

    {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}.  The javadoc tool did not generate any 
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:green}+1 core tests{color}.  The patch passed unit tests in 
hadoop-hdfs-project/hadoop-hdfs.

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

Test results: 
https://builds.apache.org/job/PreCommit-HDFS-Build/4547//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/4547//console

This message is automatically generated.
                
> DataTransfer may mask the IOException during block transfering
> --------------------------------------------------------------
>
>                 Key: HDFS-4916
>                 URL: https://issues.apache.org/jira/browse/HDFS-4916
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: datanode
>    Affects Versions: 2.0.4-alpha, 2.0.5-alpha
>            Reporter: Zesheng Wu
>            Priority: Blocker
>         Attachments: 4916.v0.patch
>
>
> When a new datanode is added to the pipeline, the client will trigger the 
> block transfer process. In the current implementation, the src datanode calls 
> the run() method of the DataTransfer to transfer the block, this method will 
> mask the IOExceptions during the transfering, and will make the client not 
> realize the failure during the transferring, as a result the client will 
> mistake the failing transferring as successful one. 

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