[ 
https://issues.apache.org/jira/browse/MAPREDUCE-7026?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16444150#comment-16444150
 ] 

Hadoop QA commented on MAPREDUCE-7026:
--------------------------------------

| (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 
16s{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} 25m 
32s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
28s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
23s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m 
34s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green}  
9m 59s{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}  1m  
1s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
27s{color} | {color:green} trunk passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  0m 
34s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
27s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  0m 
27s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
21s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m 
33s{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} 
10m 11s{color} | {color:green} patch has no errors when building and testing 
our client artifacts. {color} |
| {color:red}-1{color} | {color:red} findbugs {color} | {color:red}  1m 
11s{color} | {color:red} 
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core 
generated 2 new + 0 unchanged - 0 fixed = 2 total (was 0) {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
25s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  4m  
2s{color} | {color:green} hadoop-mapreduce-client-core in the patch passed. 
{color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
20s{color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 56m 42s{color} | 
{color:black} {color} |
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|| Reason || Tests ||
| FindBugs | 
module:hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core
 |
|  |  Found reliance on default encoding in 
org.apache.hadoop.mapreduce.task.reduce.Fetcher.copyMapOutput(MapHost, 
DataInputStream, Set, boolean):in 
org.apache.hadoop.mapreduce.task.reduce.Fetcher.copyMapOutput(MapHost, 
DataInputStream, Set, boolean): new java.io.InputStreamReader(InputStream)  At 
Fetcher.java:[line 512] |
|  |  org.apache.hadoop.mapreduce.task.reduce.Fetcher.copyMapOutput(MapHost, 
DataInputStream, Set, boolean) concatenates strings using + in a loop  At 
Fetcher.java:strings using + in a loop  At Fetcher.java:[line 514] |
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|| Subsystem || Report/Notes ||
| Docker | Client=17.05.0-ce Server=17.05.0-ce Image:yetus/hadoop:8620d2b |
| JIRA Issue | MAPREDUCE-7026 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12919810/MAPREDUCE-7026.1.patch
 |
| Optional Tests |  asflicense  compile  javac  javadoc  mvninstall  mvnsite  
unit  shadedclient  findbugs  checkstyle  |
| uname | Linux 32ef1e39e993 4.4.0-43-generic #63-Ubuntu SMP Wed Oct 12 
13:48:03 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/patchprocess/precommit/personality/provided.sh |
| git revision | trunk / 351e509 |
| maven | version: Apache Maven 3.3.9 |
| Default Java | 1.8.0_162 |
| findbugs | v3.1.0-RC1 |
| findbugs | 
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/7392/artifact/out/new-findbugs-hadoop-mapreduce-project_hadoop-mapreduce-client_hadoop-mapreduce-client-core.html
 |
|  Test Results | 
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/7392/testReport/ |
| Max. process+thread count | 418 (vs. ulimit of 10000) |
| 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://builds.apache.org/job/PreCommit-MAPREDUCE-Build/7392/console |
| Powered by | Apache Yetus 0.8.0-SNAPSHOT   http://yetus.apache.org |


This message was automatically generated.



> Shuffle Fetcher does not log the actual error message thrown by ShuffleHandler
> ------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-7026
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-7026
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: task
>    Affects Versions: 2.7.3
>            Reporter: Prabhu Joseph
>            Assignee: Prabhu Joseph
>            Priority: Major
>              Labels: supportability
>         Attachments: MAPREDUCE-7026.1.patch
>
>
> A job is failing with reduce tasks failed to fetch map output and the 
> NodeManager ShuffleHandler failed to serve the map outputs with some 
> IOException like below. ShuffleHandler sends the actual error message in 
> response inside sendError() but the Fetcher does not log this message.
> Logs from NodeManager ShuffleHandler:
> {code}
> 2017-12-18 10:10:30,728 ERROR mapred.ShuffleHandler 
> (ShuffleHandler.java:messageReceived(962)) - Shuffle error in populating 
> headers :
> java.io.IOException: Error Reading IndexFile
>         at 
> org.apache.hadoop.mapred.ShuffleHandler$Shuffle.populateHeaders(ShuffleHandler.java:1089)
>         at 
> org.apache.hadoop.mapred.ShuffleHandler$Shuffle.messageReceived(ShuffleHandler.java:958)
>         at 
> org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70)
>         at 
> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:560)
>         at 
> org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:787)
>         at 
> org.jboss.netty.handler.stream.ChunkedWriteHandler.handleUpstream(ChunkedWriteHandler.java:142)
>         at 
> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:560)
>         at 
> org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:787)
>         at 
> org.jboss.netty.handler.codec.http.HttpChunkAggregator.messageReceived(HttpChunkAggregator.java:148)
>         at 
> org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70)
>         at 
> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:560)
>         at 
> org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:787)
>         at 
> org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:296)
>         at 
> org.jboss.netty.handler.codec.frame.FrameDecoder.unfoldAndFireMessageReceived(FrameDecoder.java:459)
>         at 
> org.jboss.netty.handler.codec.replay.ReplayingDecoder.callDecode(ReplayingDecoder.java:536)
>         at 
> org.jboss.netty.handler.codec.replay.ReplayingDecoder.messageReceived(ReplayingDecoder.java:435)
>         at 
> org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70)
>         at 
> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:560)
>         at 
> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:555)
>         at 
> org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:268)
>         at 
> org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:255)
>         at 
> org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:88)
>         at 
> org.jboss.netty.channel.socket.nio.AbstractNioWorker.process(AbstractNioWorker.java:107)
>         at 
> org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:312)
>         at 
> org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:88)
>         at 
> org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:178)
>         at 
> org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)
>         at 
> org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42)
>         at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
>         at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>         at java.lang.Thread.run(Thread.java:745)
> Caused by: java.io.IOException: Owner 'hbase' for path 
> /grid/7/hadoop/yarn/local/usercache/bde/appcache/application_1512457770852_9447/output/attempt_1512457770852_9447_1_01_000007_0_10004/file.out.index
>  did not match expected owner 'bde'
>         at 
> org.apache.hadoop.io.SecureIOUtils.checkStat(SecureIOUtils.java:285)
>         at 
> org.apache.hadoop.io.SecureIOUtils.forceSecureOpenFSDataInputStream(SecureIOUtils.java:174)
>         at 
> org.apache.hadoop.io.SecureIOUtils.openFSDataInputStream(SecureIOUtils.java:158)
>         at org.apache.hadoop.mapred.SpillRecord.<init>(SpillRecord.java:70)
>         at org.apache.hadoop.mapred.SpillRecord.<init>(SpillRecord.java:62)
>         at 
> org.apache.hadoop.mapred.IndexCache.readIndexFileToCache(IndexCache.java:119)
> {code}
> Fetcher Logs below without the actual error message:
> {code}
> 2017-12-18 10:10:17,688 INFO [IPC Server handler 1 on 35118] 
> org.apache.hadoop.mapred.TaskAttemptListenerImpl: Diagnostics report from 
> attempt_1511248592679_0039_r_000000_0: Error: 
> org.apache.hadoop.mapreduce.task.reduce.Shuffle$ShuffleError: error in 
> shuffle in fetcher#3
>         at 
> org.apache.hadoop.mapreduce.task.reduce.Shuffle.run(Shuffle.java:134)
>         at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:376)
>         at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:170)
>         at java.security.AccessController.doPrivileged(Native Method)
>         at javax.security.auth.Subject.doAs(Subject.java:422)
>         at 
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1866)
>         at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:164)
> Caused by: java.io.IOException: Exceeded MAX_FAILED_UNIQUE_FETCHES; 
> bailing-out.
>         at 
> org.apache.hadoop.mapreduce.task.reduce.ShuffleSchedulerImpl.checkReducerHealth(ShuffleSchedulerImpl.java:366)
>         at 
> org.apache.hadoop.mapreduce.task.reduce.ShuffleSchedulerImpl.copyFailed(ShuffleSchedulerImpl.java:288)
>         at 
> org.apache.hadoop.mapreduce.task.reduce.Fetcher.copyFromHost(Fetcher.java:354)
>         at 
> org.apache.hadoop.mapreduce.task.reduce.Fetcher.run(Fetcher.java:193)
> {code}



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