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https://issues.apache.org/jira/browse/HDFS-14783?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16917715#comment-16917715
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Hadoop QA commented on HDFS-14783:
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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 
24s{color} | {color:blue} Docker mode activated. {color} |
| {color:blue}0{color} | {color:blue} patch {color} | {color:blue}  0m  
4s{color} | {color:blue} The patch file was not named according to hadoop's 
naming conventions. Please see https://wiki.apache.org/hadoop/HowToContribute 
for instructions. {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} 16m 
 7s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 14m 
37s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
47s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  1m 
13s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
12m 44s{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 
37s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m  
7s{color} | {color:green} trunk passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  0m 
43s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 13m 
53s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 13m 
53s{color} | {color:green} the patch passed {color} |
| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange}  
0m 45s{color} | {color:orange} hadoop-common-project/hadoop-common: The patch 
generated 1 new + 25 unchanged - 0 fixed = 26 total (was 25) {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  1m 
11s{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 40s{color} | {color:green} patch has no errors when building and testing 
our client artifacts. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  1m 
49s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m  
8s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  8m 
52s{color} | {color:green} hadoop-common in the patch passed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
45s{color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 88m 40s{color} | 
{color:black} {color} |
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|| Subsystem || Report/Notes ||
| Docker | Client=19.03.1 Server=19.03.1 Image:yetus/hadoop:bdbca0e53b4 |
| JIRA Issue | HDFS-14783 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12978751/HDFS-14783 |
| Optional Tests |  dupname  asflicense  compile  javac  javadoc  mvninstall  
mvnsite  unit  shadedclient  findbugs  checkstyle  |
| uname | Linux 40ca6fe7f485 4.15.0-58-generic #64-Ubuntu SMP Tue Aug 6 
11:12:41 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/patchprocess/precommit/personality/provided.sh |
| git revision | trunk / 55cc115 |
| maven | version: Apache Maven 3.3.9 |
| Default Java | 1.8.0_222 |
| findbugs | v3.1.0-RC1 |
| checkstyle | 
https://builds.apache.org/job/PreCommit-HDFS-Build/27698/artifact/out/diff-checkstyle-hadoop-common-project_hadoop-common.txt
 |
|  Test Results | 
https://builds.apache.org/job/PreCommit-HDFS-Build/27698/testReport/ |
| Max. process+thread count | 1392 (vs. ulimit of 5500) |
| modules | C: hadoop-common-project/hadoop-common U: 
hadoop-common-project/hadoop-common |
| Console output | 
https://builds.apache.org/job/PreCommit-HDFS-Build/27698/console |
| Powered by | Apache Yetus 0.8.0   http://yetus.apache.org |


This message was automatically generated.



> expired SlowPeersReport will keep staying on namenode's jmx
> -----------------------------------------------------------
>
>                 Key: HDFS-14783
>                 URL: https://issues.apache.org/jira/browse/HDFS-14783
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: HaiBin Huang
>            Assignee: HaiBin Huang
>            Priority: Major
>         Attachments: HDFS-14783
>
>
> SlowPeersReport in namenode's jmx can tell us which datanode is slow node, 
> and it is calculated by the average duration between two datanode sending 
> packet. Here is an example, if dn1 send packet to dn2 tasks too long in 
> average (over the *upperLimitLatency*), you will see SlowPeersReport in 
> namenode's jmx like this :
> {code:java}
> "SlowPeersReport" :[{"SlowNode":"dn2","ReportingNodes":["dn1"]}]
> {code}
> However, if dn1 just sending some packet to dn2 with a slow speed in the 
> beginning , then didn't send any packet to dn2 for a long time, which will 
> keep the abovementioned SlowPeersReport staying on namenode's jmx . I think 
> this SlowPeersReport might be an expired message, because the network between 
> dn1 and dn2 may have returned to normal, but the SlowPeersReport is still on 
> nameonode's jmx until next time dn1 sending packet to dn2. So I use a 
> timestamp to record when an *org.apache.hadoop.metrics2.util.SampleStat* is 
> created, and calculate the average duration with the valid *SampleStat ,* 
> which is judged by it  timestamp.



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