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https://issues.apache.org/jira/browse/HADOOP-12657?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15063536#comment-15063536
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Hadoop QA commented on HADOOP-12657:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 0m 0s 
{color} | {color:blue} Docker mode activated. {color} |
| {color:green}+1{color} | {color:green} @author {color} | {color:green} 0m 0s 
{color} | {color:green} The patch does not contain any @author tags. {color} |
| {color:green}+1{color} | {color:green} test4tests {color} | {color:green} 0m 
0s {color} | {color:green} The patch appears to include 2 new or modified test 
files. {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 7m 
24s {color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 8m 10s 
{color} | {color:green} trunk passed with JDK v1.8.0_66 {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 8m 34s 
{color} | {color:green} trunk passed with JDK v1.7.0_91 {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m 
16s {color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 1m 0s 
{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 
14s {color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 1m 
47s {color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 52s 
{color} | {color:green} trunk passed with JDK v1.8.0_66 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 1m 1s 
{color} | {color:green} trunk passed with JDK v1.7.0_91 {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 1m 
41s {color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 7m 58s 
{color} | {color:green} the patch passed with JDK v1.8.0_66 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 7m 58s 
{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 8m 43s 
{color} | {color:green} the patch passed with JDK v1.7.0_91 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 8m 43s 
{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m 
15s {color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 1m 1s 
{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 
14s {color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} whitespace {color} | {color:green} 0m 
0s {color} | {color:green} Patch has no whitespace issues. {color} |
| {color:green}+1{color} | {color:green} xml {color} | {color:green} 0m 0s 
{color} | {color:green} The patch has no ill-formed XML file. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 1m 
59s {color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 53s 
{color} | {color:green} the patch passed with JDK v1.8.0_66 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 1m 3s 
{color} | {color:green} the patch passed with JDK v1.7.0_91 {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 6m 59s {color} 
| {color:red} hadoop-common in the patch failed with JDK v1.8.0_66. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 7m 24s 
{color} | {color:green} hadoop-common in the patch passed with JDK v1.7.0_91. 
{color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m 
22s {color} | {color:green} Patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 68m 55s {color} 
| {color:black} {color} |
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|| Reason || Tests ||
| JDK v1.8.0_66 Failed junit tests | hadoop.ipc.TestIPC |
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|| Subsystem || Report/Notes ||
| Docker |  Image:yetus/hadoop:0ca8df7 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12777652/HDFS-8836-07.patch |
| JIRA Issue | HADOOP-12657 |
| Optional Tests |  asflicense  compile  javac  javadoc  mvninstall  mvnsite  
unit  findbugs  checkstyle  xml  |
| uname | Linux ee783aa3ae64 3.13.0-36-lowlatency #63-Ubuntu SMP PREEMPT Wed 
Sep 3 21:56:12 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/hadoop/patchprocess/precommit/personality/provided.sh 
|
| git revision | trunk / bd5e207 |
| findbugs | v3.0.0 |
| unit | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/8272/artifact/patchprocess/patch-unit-hadoop-common-project_hadoop-common-jdk1.8.0_66.txt
 |
| unit test logs |  
https://builds.apache.org/job/PreCommit-HADOOP-Build/8272/artifact/patchprocess/patch-unit-hadoop-common-project_hadoop-common-jdk1.8.0_66.txt
 |
| JDK v1.7.0_91  Test Results | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/8272/testReport/ |
| modules | C: hadoop-common-project/hadoop-common U: 
hadoop-common-project/hadoop-common |
| Max memory used | 75MB |
| Powered by | Apache Yetus 0.2.0-SNAPSHOT   http://yetus.apache.org |
| Console output | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/8272/console |


This message was automatically generated.



> Add a option to skip newline on empty files with getMerge -nl
> -------------------------------------------------------------
>
>                 Key: HADOOP-12657
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12657
>             Project: Hadoop Common
>          Issue Type: New Feature
>    Affects Versions: 2.6.0, 2.7.1
>            Reporter: Jan Filipiak
>            Assignee: Kanaka Kumar Avvaru
>            Priority: Minor
>             Fix For: 2.8.0
>
>         Attachments: HDFS-8836-01.patch, HDFS-8836-02.patch, 
> HDFS-8836-03.patch, HDFS-8836-04.patch, HDFS-8836-05.patch, 
> HDFS-8836-06.patch, HDFS-8836-07.patch
>
>
> Hello everyone,
> I recently was in the need of using the new line option -nl with getMerge 
> because the files I needed to merge simply didn't had one. I was merging all 
> the files from one directory and unfortunately this directory also included 
> empty files, which effectively led to multiple newlines append after some 
> files. I needed to remove them manually afterwards.
> In this situation it is maybe good to have another argument that allows 
> skipping empty files.
> Thing one could try to implement this feature:
> The call for IOUtils.copyBytes(in, out, getConf(), false); doesn't
> return the number of bytes copied which would be convenient as one could
> skip append the new line when 0 bytes where copied or one would check the 
> file size before.
> I posted this Idea on the mailing list 
> http://mail-archives.apache.org/mod_mbox/hadoop-user/201507.mbox/%3C55B25140.3060005%40trivago.com%3E
>  but I didn't really get many responses, so I thought I my try this way.



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