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https://issues.apache.org/jira/browse/MAPREDUCE-6728?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15511408#comment-15511408
 ] 

Hadoop QA commented on MAPREDUCE-6728:
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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 15s 
{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:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 0m 8s 
{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 6m 
40s {color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 1m 35s 
{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m 
30s {color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 0m 46s 
{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 
26s {color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 1m 
10s {color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 34s 
{color} | {color:green} trunk passed {color} |
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 0m 9s 
{color} | {color:blue} Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 0m 
47s {color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 1m 39s 
{color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} javac {color} | {color:red} 1m 39s {color} 
| {color:red} hadoop-mapreduce-project_hadoop-mapreduce-client generated 1 new 
+ 364 unchanged - 0 fixed = 365 total (was 364) {color} |
| {color:red}-1{color} | {color:red} checkstyle {color} | {color:red} 0m 27s 
{color} | {color:red} hadoop-mapreduce-project/hadoop-mapreduce-client: The 
patch generated 2 new + 277 unchanged - 3 fixed = 279 total (was 280) {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 0m 43s 
{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 
21s {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:red}-1{color} | {color:red} findbugs {color} | {color:red} 0m 30s 
{color} | {color:red} 
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-shuffle
 generated 1 new + 0 unchanged - 0 fixed = 1 total (was 0) {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 37s 
{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 2m 26s 
{color} | {color:green} hadoop-mapreduce-client-core in the patch passed. 
{color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 0m 21s 
{color} | {color:green} hadoop-mapreduce-client-shuffle in the patch passed. 
{color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m 
19s {color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 22m 2s {color} | 
{color:black} {color} |
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|| Reason || Tests ||
| FindBugs | 
module:hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-shuffle
 |
|  |  Class org.apache.hadoop.mapred.ShuffleHandler$Shuffle$4 defines 
non-transient non-serializable instance field this$1  In 
ShuffleHandler.java:instance field this$1  In ShuffleHandler.java |
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|| Subsystem || Report/Notes ||
| Docker |  Image:yetus/hadoop:9560f25 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12829700/mapreduce6728.002.patch
 |
| JIRA Issue | MAPREDUCE-6728 |
| Optional Tests |  asflicense  compile  javac  javadoc  mvninstall  mvnsite  
unit  findbugs  checkstyle  |
| uname | Linux 4817f521e28a 3.13.0-93-generic #140-Ubuntu SMP Mon Jul 18 
21:21:05 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/hadoop/patchprocess/precommit/personality/provided.sh 
|
| git revision | trunk / 964e546 |
| Default Java | 1.8.0_101 |
| findbugs | v3.0.0 |
| javac | 
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/6731/artifact/patchprocess/diff-compile-javac-hadoop-mapreduce-project_hadoop-mapreduce-client.txt
 |
| checkstyle | 
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/6731/artifact/patchprocess/diff-checkstyle-hadoop-mapreduce-project_hadoop-mapreduce-client.txt
 |
| findbugs | 
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/6731/artifact/patchprocess/new-findbugs-hadoop-mapreduce-project_hadoop-mapreduce-client_hadoop-mapreduce-client-shuffle.html
 |
|  Test Results | 
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/6731/testReport/ |
| modules | C: 
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core 
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-shuffle
 U: hadoop-mapreduce-project/hadoop-mapreduce-client |
| Console output | 
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/6731/console |
| Powered by | Apache Yetus 0.3.0   http://yetus.apache.org |


This message was automatically generated.



> Give fetchers hint when ShuffleHandler rejects a shuffling connection
> ---------------------------------------------------------------------
>
>                 Key: MAPREDUCE-6728
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6728
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: mrv2
>            Reporter: Haibo Chen
>            Assignee: Haibo Chen
>         Attachments: mapreduce6728.001.patch, mapreduce6728.002.patch, 
> mapreduce6728.prelim.patch
>
>
> If # of open shuffle connection to a node goes over the max, ShuffleHandler 
> closes the connection immediately without giving fetchers any hint of the 
> reason, which causes fetchers to fail due to exceptions 
> java.net.SocketException: Unexpected end of file from server
>       at sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:772)
>       at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:633)
>       at sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:769)
>       at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:633)
>       at 
> sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1323)
>       at 
> java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:468)
>       at 
> org.apache.hadoop.mapreduce.task.reduce.Fetcher.verifyConnection(Fetcher.java:430)
>       at 
> org.apache.hadoop.mapreduce.task.reduce.Fetcher.setupConnectionsWithRetry(Fetcher.java:395)
>       at 
> org.apache.hadoop.mapreduce.task.reduce.Fetcher.openShuffleUrl(Fetcher.java:266)
>       at 
> org.apache.hadoop.mapreduce.task.reduce.Fetcher.copyFromHost(Fetcher.java:323)
>       at org.apache.hadoop.mapreduce.task.reduce.Fetcher.run(Fetcher.java:193)
> OR 
> java.net.SocketException: Connection reset
>       at java.net.SocketInputStream.read(SocketInputStream.java:196)
>       at java.net.SocketInputStream.read(SocketInputStream.java:122)
>       at java.io.BufferedInputStream.fill(BufferedInputStream.java:235)
>       at java.io.BufferedInputStream.read1(BufferedInputStream.java:275)
>       at java.io.BufferedInputStream.read(BufferedInputStream.java:334)
>       at sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:687)
>       at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:633)
>       at sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:769)
>       at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:633)
>       at 
> sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1323)
>       at 
> java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:468)
>       at 
> org.apache.hadoop.mapreduce.task.reduce.Fetcher.verifyConnection(Fetcher.java:430)
>       at 
> org.apache.hadoop.mapreduce.task.reduce.Fetcher.setupConnectionsWithRetry(Fetcher.java:395)
>       at 
> org.apache.hadoop.mapreduce.task.reduce.Fetcher.openShuffleUrl(Fetcher.java:266)
>       at 
> org.apache.hadoop.mapreduce.task.reduce.Fetcher.copyFromHost(Fetcher.java
> Such failures are counted as fetcher failures



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