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https://issues.apache.org/jira/browse/HADOOP-16775?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17002017#comment-17002017
 ] 

Hadoop QA commented on HADOOP-16775:
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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 
34s{color} | {color:blue} Docker mode activated. {color} |
|| || || || {color:brown} Prechecks {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:red}-1{color} | {color:red} test4tests {color} | {color:red}  0m  
0s{color} | {color:red} 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} |
|| || || || {color:brown} trunk Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 20m 
11s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
23s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
20s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m 
26s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
13m 27s{color} | {color:green} branch has no errors when building and testing 
our client artifacts. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  0m 
33s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
20s{color} | {color:green} trunk passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  0m 
24s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
18s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  0m 
18s{color} | {color:green} the patch passed {color} |
| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange}  
0m 13s{color} | {color:orange} hadoop-tools/hadoop-distcp: The patch generated 
1 new + 4 unchanged - 0 fixed = 5 total (was 4) {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m 
20s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} whitespace {color} | {color:green}  0m 
 0s{color} | {color:green} The patch has no whitespace issues. {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
13m 43s{color} | {color:green} patch has no errors when building and testing 
our client artifacts. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  0m 
36s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
17s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 12m 
23s{color} | {color:green} hadoop-distcp in the patch passed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
30s{color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 65m 24s{color} | 
{color:black} {color} |
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|| Subsystem || Report/Notes ||
| Docker | Client=19.03.5 Server=19.03.5 Image:yetus/hadoop:e573ea49085 |
| JIRA Issue | HADOOP-16775 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12989354/HADOOP-16775.patch |
| Optional Tests |  dupname  asflicense  compile  javac  javadoc  mvninstall  
mvnsite  unit  shadedclient  findbugs  checkstyle  |
| uname | Linux 9097d834b700 4.15.0-66-generic #75-Ubuntu SMP Tue Oct 1 
05:24:09 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/patchprocess/precommit/personality/provided.sh |
| git revision | trunk / e2a5448 |
| maven | version: Apache Maven 3.3.9 |
| Default Java | 1.8.0_232 |
| findbugs | v3.1.0-RC1 |
| checkstyle | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/16712/artifact/out/diff-checkstyle-hadoop-tools_hadoop-distcp.txt
 |
|  Test Results | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/16712/testReport/ |
| Max. process+thread count | 316 (vs. ulimit of 5500) |
| modules | C: hadoop-tools/hadoop-distcp U: hadoop-tools/hadoop-distcp |
| Console output | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/16712/console |
| Powered by | Apache Yetus 0.8.0   http://yetus.apache.org |


This message was automatically generated.



> Hadoop DistCp reuses the same temp file within the task for different files.
> ----------------------------------------------------------------------------
>
>                 Key: HADOOP-16775
>                 URL: https://issues.apache.org/jira/browse/HADOOP-16775
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: tools/distcp
>    Affects Versions: 2.0
>            Reporter: Amir Shenavandeh
>            Priority: Major
>              Labels: DistCp, S3, hadoop-tools
>         Attachments: HADOOP-16775.patch
>
>
> Hadoop DistCp reuses the same temp file name for all the files copied within 
> each task attempt and then moves them to the target name, which is also a 
> server side copy. For copies to S3, this will cause inconsistency as S3 is 
> only consistent for reads after writes, for brand new objects. There is also 
> inconsistency for contents of overwritten objects on S3.
> To avoid this, we should randomize the temp file name and for each temp file 
> use a different name.
>  



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