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https://issues.apache.org/jira/browse/TEZ-4233?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17200728#comment-17200728
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Hadoop QA commented on TEZ-4233:
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| (/) *{color:green}+1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue}  0m 
29s{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} No case conflicting files found. {color} |
| {color:blue}0{color} | {color:blue} prototool {color} | {color:blue}  0m  
0s{color} | {color:blue} prototool was not available. {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 7 new or modified test 
files. {color} |
|| || || || {color:brown} master Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 
20s{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  4m 
37s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  2m 
21s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  1m 
43s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  2m 
16s{color} | {color:green} master passed {color} |
| {color:blue}0{color} | {color:blue} spotbugs {color} | {color:blue}  0m 
37s{color} | {color:blue} Used deprecated FindBugs config; considering 
switching to SpotBugs. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  4m 
48s{color} | {color:green} master passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 
10s{color} | {color:blue} Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  1m 
49s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m 
27s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} cc {color} | {color:green}  1m 
27s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  1m 
27s{color} | {color:green} the patch passed {color} |
| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange}  
0m 18s{color} | {color:orange} tez-runtime-library: The patch generated 7 new + 
192 unchanged - 12 fixed = 199 total (was 204) {color} |
| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange}  
0m 19s{color} | {color:orange} tez-dag: The patch generated 1 new + 85 
unchanged - 1 fixed = 86 total (was 86) {color} |
| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange}  
0m 10s{color} | {color:orange} tez-plugins/tez-aux-services: The patch 
generated 6 new + 76 unchanged - 3 fixed = 82 total (was 79) {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} javadoc {color} | {color:green}  1m 
35s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  4m 
59s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  1m 
55s{color} | {color:green} tez-api in the patch passed. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  0m 
32s{color} | {color:green} tez-runtime-internals in the patch passed. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  5m  
2s{color} | {color:green} tez-runtime-library in the patch passed. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  4m 
13s{color} | {color:green} tez-dag in the patch passed. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  2m 
30s{color} | {color:green} tez-aux-services in the patch passed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
38s{color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 44m 26s{color} | 
{color:black} {color} |
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|| Subsystem || Report/Notes ||
| Docker | ClientAPI=1.40 ServerAPI=1.40 base: 
https://ci-hadoop.apache.org/job/PreCommit-TEZ-Build/24/artifact/out/Dockerfile 
|
| JIRA Issue | TEZ-4233 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/13012002/TEZ-4233.04.patch |
| Optional Tests | dupname asflicense javac javadoc unit spotbugs findbugs 
checkstyle compile cc prototool |
| uname | Linux 36dcf9031456 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 | personality/tez.sh |
| git revision | master / 1fba8f71a |
| Default Java | Private Build-1.8.0_265-8u265-b01-0ubuntu2~18.04-b01 |
| checkstyle | 
https://ci-hadoop.apache.org/job/PreCommit-TEZ-Build/24/artifact/out/diff-checkstyle-tez-runtime-library.txt
 |
| checkstyle | 
https://ci-hadoop.apache.org/job/PreCommit-TEZ-Build/24/artifact/out/diff-checkstyle-tez-dag.txt
 |
| checkstyle | 
https://ci-hadoop.apache.org/job/PreCommit-TEZ-Build/24/artifact/out/diff-checkstyle-tez-plugins_tez-aux-services.txt
 |
|  Test Results | 
https://ci-hadoop.apache.org/job/PreCommit-TEZ-Build/24/testReport/ |
| Max. process+thread count | 1535 (vs. ulimit of 5500) |
| modules | C: tez-api tez-runtime-internals tez-runtime-library tez-dag 
tez-plugins/tez-aux-services U: . |
| Console output | 
https://ci-hadoop.apache.org/job/PreCommit-TEZ-Build/24/console |
| versions | git=2.17.1 maven=3.6.0 findbugs=3.0.1 |
| Powered by | Apache Yetus 0.12.0 https://yetus.apache.org |


This message was automatically generated.



> Map task should be blamed earlier for local fetch failures
> ----------------------------------------------------------
>
>                 Key: TEZ-4233
>                 URL: https://issues.apache.org/jira/browse/TEZ-4233
>             Project: Apache Tez
>          Issue Type: Improvement
>            Reporter: László Bodor
>            Assignee: László Bodor
>            Priority: Major
>         Attachments: TEZ-4233.01.patch, TEZ-4233.02.patch, TEZ-4233.03.patch, 
> TEZ-4233.04.patch
>
>
> Fetch failures can be a result of network issue or disk issue. Currently, AM 
> doesn't know about whether the original input read error happened because of 
> a local fetch failure or not. I think if a map output was reported as a 
> subject of local fetch failure, AM should respond earlier, and blame it as 
> soon as possible. Here is a hidden assumption that a disk read should never 
> fail (or relatively rarely compared to network issues).
> When I detected this issue, it was a Kubernetes based LLAP environment, where 
> a daemon completely disappeared and a new daemon - running reducer tasks - 
> assumed that it has map outputs locally, which wasn't the case. 
> This patch can help in container mode as well, as we can assume that a local 
> read should work, and if it's not, the original map output data should be 
> re-generated as soon as possible.



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