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https://issues.apache.org/jira/browse/HADOOP-13017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15602957#comment-15602957
 ] 

Hadoop QA commented on HADOOP-13017:
------------------------------------

| (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: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:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  1m 
37s{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  7m 
25s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  6m 
58s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  1m 
29s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  2m  
9s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green}  0m 
53s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  3m 
31s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m 
34s{color} | {color:green} trunk passed {color} |
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 
15s{color} | {color:blue} Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  1m 
53s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  7m 
59s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  7m 
59s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  1m 
38s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  2m 
24s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green}  1m 
 1s{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} findbugs {color} | {color:green}  4m 
54s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m 
47s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  7m 
40s{color} | {color:green} hadoop-common in the patch passed. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  1m 
14s{color} | {color:green} hadoop-hdfs-client in the patch passed. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 10m 
59s{color} | {color:green} hadoop-distcp in the patch passed. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  0m 
19s{color} | {color:green} hadoop-openstack in the patch passed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
27s{color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 91m 44s{color} | 
{color:black} {color} |
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|| Subsystem || Report/Notes ||
| Docker |  Image:yetus/hadoop:9560f25 |
| JIRA Issue | HADOOP-13017 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12834982/HADOOP-13017-002.patch
 |
| Optional Tests |  asflicense  compile  javac  javadoc  mvninstall  mvnsite  
unit  findbugs  checkstyle  |
| uname | Linux d46896bbdb93 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 / b18f35f |
| Default Java | 1.8.0_101 |
| findbugs | v3.0.0 |
|  Test Results | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/10876/testReport/ |
| modules | C: hadoop-common-project/hadoop-common 
hadoop-hdfs-project/hadoop-hdfs-client hadoop-tools/hadoop-distcp 
hadoop-tools/hadoop-openstack U: . |
| Console output | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/10876/console |
| Powered by | Apache Yetus 0.4.0-SNAPSHOT   http://yetus.apache.org |


This message was automatically generated.



> Implementations of InputStream.read(buffer, offset, bytes) to exit 0 if 
> bytes==0
> --------------------------------------------------------------------------------
>
>                 Key: HADOOP-13017
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13017
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: io
>    Affects Versions: 2.8.0
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>         Attachments: HADOOP-13017-002.patch, HDFS-13017-001.patch
>
>
> HDFS-10277 showed that HDFS was return -1 on read(buf[], 0, 0) when there was 
> no data left in the stream; Java IO says 
> bq. If {{len}} is zero, then no bytes are read and {{0}} is returned; 
> otherwise, there is an attempt to read at least one byte.
> Review the implementations of {{IOStream.(buffer, offset, bytes)} and, where 
> necessary and considered safe, add a fast exit if the length is 0.



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