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https://issues.apache.org/jira/browse/HADOOP-16947?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17073007#comment-17073007
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Hadoop QA commented on HADOOP-16947:
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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 
36s{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:green}+1{color} | {color:green} test4tests {color} | {color:green}  0m 
 0s{color} | {color:green} The patch appears to include 1 new or modified test 
files. {color} |
|| || || || {color:brown} trunk Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 
26s{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 20m 
18s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 15m 
47s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  2m 
36s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  2m 
34s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
20m 21s{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}  4m 
58s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m 
40s{color} | {color:green} trunk passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 
20s{color} | {color:blue} Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  1m 
50s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 15m 
15s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 15m 
15s{color} | {color:green} the patch passed {color} |
| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange}  
2m 36s{color} | {color:orange} root: The patch generated 1 new + 0 unchanged - 
0 fixed = 1 total (was 0) {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  2m 
25s{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} 
14m 10s{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}  2m  
8s{color} | {color:red} hadoop-common-project/hadoop-common generated 1 new + 0 
unchanged - 0 fixed = 1 total (was 0) {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m 
41s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  9m 
21s{color} | {color:green} hadoop-common in the patch passed. {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red}103m 40s{color} 
| {color:red} hadoop-hdfs in the patch passed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
50s{color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black}224m 38s{color} | 
{color:black} {color} |
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|| Reason || Tests ||
| FindBugs | module:hadoop-common-project/hadoop-common |
|  |  Inconsistent synchronization of 
org.apache.hadoop.metrics2.lib.MutableRollingAverages.skipExpired; locked 50% 
of time  Unsynchronized access at MutableRollingAverages.java:50% of time  
Unsynchronized access at MutableRollingAverages.java:[line 294] |
| Failed junit tests | 
hadoop.hdfs.server.namenode.TestDecommissioningStatusWithBackoffMonitor |
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|| Subsystem || Report/Notes ||
| Docker | Client=19.03.8 Server=19.03.8 Image:yetus/hadoop:4454c6d14b7 |
| JIRA Issue | HADOOP-16947 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12998462/HADOOP-16947-003.patch
 |
| Optional Tests |  dupname  asflicense  compile  javac  javadoc  mvninstall  
mvnsite  unit  shadedclient  findbugs  checkstyle  |
| uname | Linux b1cb8393b517 4.15.0-74-generic #84-Ubuntu SMP Thu Dec 19 
08:06:28 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/patchprocess/precommit/personality/provided.sh |
| git revision | trunk / c613296 |
| maven | version: Apache Maven 3.3.9 |
| Default Java | 1.8.0_242 |
| findbugs | v3.1.0-RC1 |
| checkstyle | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/16808/artifact/out/diff-checkstyle-root.txt
 |
| findbugs | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/16808/artifact/out/new-findbugs-hadoop-common-project_hadoop-common.html
 |
| unit | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/16808/artifact/out/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt
 |
|  Test Results | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/16808/testReport/ |
| Max. process+thread count | 2910 (vs. ulimit of 5500) |
| modules | C: hadoop-common-project/hadoop-common 
hadoop-hdfs-project/hadoop-hdfs U: . |
| Console output | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/16808/console |
| Powered by | Apache Yetus 0.8.0   http://yetus.apache.org |


This message was automatically generated.



> Expired SampleStat should ignore when generating SlowPeersReport
> ----------------------------------------------------------------
>
>                 Key: HADOOP-16947
>                 URL: https://issues.apache.org/jira/browse/HADOOP-16947
>             Project: Hadoop Common
>          Issue Type: Bug
>            Reporter: Haibin Huang
>            Assignee: Haibin Huang
>            Priority: Major
>         Attachments: HADOOP-16947-001.patch, HADOOP-16947-002.patch, 
> HADOOP-16947-003.patch, HDFS-14783, HDFS-14783-001.patch, 
> HDFS-14783-002.patch, HDFS-14783-003.patch, HDFS-14783-004.patch, 
> HDFS-14783-005.patch
>
>
> SlowPeersReport is generated by the SampleStat between tow dn, so it can 
> present on nn's jmx like this:
> {code:java}
> "SlowPeersReport" :[{"SlowNode":"dn2","ReportingNodes":["dn1"]}]
> {code}
> In each period, MutableRollingAverages will do a rollOverAvgs(), it will 
> generate a SumAndCount object which is based on SampleStat, and store it in a 
> LinkedBlockingDeque<SumAndCount>, the deque will be used to generate  
> SlowPeersReport. And the old member of deque won't be removed until the queue 
> is full. However, if dn1 don't send any packet to dn2 in the last of 
> 36*300_000 ms, the deque will be filled with an old member, because the 
> number of last SampleStat never change.I think these old SampleStats should 
> be considered as expired message and ignore them when generating a new 
> SlowPeersReport.



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