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https://issues.apache.org/jira/browse/MAPREDUCE-7282?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17201605#comment-17201605
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Hadoop QA commented on MAPREDUCE-7282:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime ||  Logfile || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue}  1m 
15s{color} | {color:blue}{color} | {color:blue} Docker mode activated. {color} |
|| || || || {color:brown} Prechecks {color} || ||
| {color:green}+1{color} | {color:green} dupname {color} | {color:green}  0m  
0s{color} | {color:green}{color} | {color:green} No case conflicting files 
found. {color} |
| {color:green}+1{color} | {color:green} @author {color} | {color:green}  0m  
0s{color} | {color:green}{color} | {color:green} The patch does not contain any 
@author tags. {color} |
| {color:green}+1{color} | {color:green} {color} | {color:green}  0m  0s{color} 
| {color:green}test4tests{color} | {color:green} The patch appears to include 2 
new or modified test files. {color} |
|| || || || {color:brown} trunk Compile Tests {color} || ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 31m 
21s{color} | {color:green}{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
39s{color} | {color:green}{color} | {color:green} trunk passed with JDK 
Ubuntu-11.0.8+10-post-Ubuntu-0ubuntu118.04.1 {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
34s{color} | {color:green}{color} | {color:green} trunk passed with JDK Private 
Build-1.8.0_265-8u265-b01-0ubuntu2~18.04-b01 {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
29s{color} | {color:green}{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m 
45s{color} | {color:green}{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
15m 41s{color} | {color:green}{color} | {color:green} branch has no errors when 
building and testing our client artifacts. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
25s{color} | {color:green}{color} | {color:green} trunk passed with JDK 
Ubuntu-11.0.8+10-post-Ubuntu-0ubuntu118.04.1 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
23s{color} | {color:green}{color} | {color:green} trunk passed with JDK Private 
Build-1.8.0_265-8u265-b01-0ubuntu2~18.04-b01 {color} |
| {color:blue}0{color} | {color:blue} spotbugs {color} | {color:blue}  1m 
15s{color} | {color:blue}{color} | {color:blue} Used deprecated FindBugs 
config; considering switching to SpotBugs. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  1m 
13s{color} | {color:green}{color} | {color:green} trunk passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} || ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  0m 
30s{color} | {color:green}{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
32s{color} | {color:green}{color} | {color:green} the patch passed with JDK 
Ubuntu-11.0.8+10-post-Ubuntu-0ubuntu118.04.1 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  0m 
32s{color} | {color:green}{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
28s{color} | {color:green}{color} | {color:green} the patch passed with JDK 
Private Build-1.8.0_265-8u265-b01-0ubuntu2~18.04-b01 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  0m 
28s{color} | {color:green}{color} | {color:green} the patch passed {color} |
| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange}  
0m 20s{color} | 
{color:orange}https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2320/3/artifact/out/diff-checkstyle-hadoop-mapreduce-project_hadoop-mapreduce-client_hadoop-mapreduce-client-core.txt{color}
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hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core: 
The patch generated 1 new + 46 unchanged - 5 fixed = 47 total (was 51) {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m 
30s{color} | {color:green}{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} whitespace {color} | {color:green}  0m 
 0s{color} | {color:green}{color} | {color:green} The patch has no whitespace 
issues. {color} |
| {color:green}+1{color} | {color:green} xml {color} | {color:green}  0m  
2s{color} | {color:green}{color} | {color:green} The patch has no ill-formed 
XML file. {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
15m 27s{color} | {color:green}{color} | {color:green} patch has no errors when 
building and testing our client artifacts. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
19s{color} | {color:green}{color} | {color:green} the patch passed with JDK 
Ubuntu-11.0.8+10-post-Ubuntu-0ubuntu118.04.1 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
19s{color} | {color:green}{color} | {color:green} the patch passed with JDK 
Private Build-1.8.0_265-8u265-b01-0ubuntu2~18.04-b01 {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  1m 
35s{color} | {color:green}{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} || ||
| {color:red}-1{color} | {color:red} unit {color} | {color:red}  7m 24s{color} 
| 
{color:red}https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2320/3/artifact/out/patch-unit-hadoop-mapreduce-project_hadoop-mapreduce-client_hadoop-mapreduce-client-core.txt{color}
 | {color:red} hadoop-mapreduce-client-core in the patch passed. {color} |
| {color:red}-1{color} | {color:red} asflicense {color} | {color:red}  0m 
34s{color} | 
{color:red}https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2320/3/artifact/out/patch-asflicense-problems.txt{color}
 | {color:red} The patch generated 1 ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black} 82m 26s{color} | 
{color:black}{color} | {color:black}{color} |
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|| Reason || Tests ||
| Failed junit tests | hadoop.mapreduce.lib.output.TestFileOutputCommitter |
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|| Subsystem || Report/Notes ||
| Docker | ClientAPI=1.40 ServerAPI=1.40 base: 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2320/3/artifact/out/Dockerfile
 |
| GITHUB PR | https://github.com/apache/hadoop/pull/2320 |
| JIRA Issue | MAPREDUCE-7282 |
| Optional Tests | dupname asflicense compile javac javadoc mvninstall mvnsite 
unit shadedclient findbugs checkstyle xml |
| uname | Linux eec7aa3889e7 4.15.0-112-generic #113-Ubuntu SMP Thu Jul 9 
23:41:39 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | dev-support/bin/hadoop.sh |
| git revision | trunk / 3ccc962b990 |
| Default Java | Private Build-1.8.0_265-8u265-b01-0ubuntu2~18.04-b01 |
| Multi-JDK versions | 
/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.8+10-post-Ubuntu-0ubuntu118.04.1 
/usr/lib/jvm/java-8-openjdk-amd64:Private 
Build-1.8.0_265-8u265-b01-0ubuntu2~18.04-b01 |
|  Test Results | 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2320/3/testReport/ |
| Max. process+thread count | 1596 (vs. ulimit of 5500) |
| modules | C: 
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core 
U: 
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core |
| Console output | 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2320/3/console |
| versions | git=2.17.1 maven=3.6.0 findbugs=4.0.6 |
| Powered by | Apache Yetus 0.13.0-SNAPSHOT https://yetus.apache.org |


This message was automatically generated.



> MR v2 commit algorithm should be deprecated and not the default
> ---------------------------------------------------------------
>
>                 Key: MAPREDUCE-7282
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-7282
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>    Affects Versions: 3.3.0, 3.2.1, 3.1.3, 3.3.1
>            Reporter: Steve Loughran
>            Priority: Major
>
> The v2 MR commit algorithm moves files from the task attempt dir into the 
> dest dir on task commit -one by one
> It is therefore not atomic
> # if a task commit fails partway through and another task attempt commits 
> -unless exactly the same filenames are used, output of the first attempt may 
> be included in the final result
> # if a worker partitions partway through task commit, and then continues 
> after another attempt has committed, it may partially overwrite the output 
> -even when the filenames are the same
> Both MR and spark assume that task commits are atomic. Either they need to 
> consider that this is not the case, we add a way to probe for a committer 
> supporting atomic task commit, and the engines both add handling for task 
> commit failures (probably fail job)
> Better: we remove this as the default, maybe also warn when it is being used



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