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https://issues.apache.org/jira/browse/HDFS-10742?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15434085#comment-15434085
 ] 

Hadoop QA commented on HDFS-10742:
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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 
12s{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:green}+1{color} | {color:green} mvninstall {color} | {color:green}  7m 
14s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
51s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
27s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m 
54s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green}  0m 
12s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  1m 
45s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
55s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  0m 
48s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
46s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  0m 
46s{color} | {color:green} the patch passed {color} |
| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange}  
0m 25s{color} | {color:orange} hadoop-hdfs-project/hadoop-hdfs: The patch 
generated 2 new + 109 unchanged - 0 fixed = 111 total (was 109) {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m 
52s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green}  0m 
10s{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}  1m 
54s{color} | {color:red} hadoop-hdfs-project/hadoop-hdfs generated 2 new + 0 
unchanged - 0 fixed = 2 total (was 0) {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
52s{color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 60m 29s{color} 
| {color:red} hadoop-hdfs in the patch failed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
17s{color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 80m 23s{color} | 
{color:black} {color} |
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|| Reason || Tests ||
| FindBugs | module:hadoop-hdfs-project/hadoop-hdfs |
|  |  Sequence of calls to java.util.concurrent.ConcurrentHashMap may not be 
atomic in org.apache.hadoop.hdfs.InstrumentedLock.check(long, long)  At 
InstrumentedLock.java:may not be atomic in 
org.apache.hadoop.hdfs.InstrumentedLock.check(long, long)  At 
InstrumentedLock.java:[line 164] |
|  |  Sequence of calls to java.util.concurrent.ConcurrentHashMap may not be 
atomic in org.apache.hadoop.hdfs.InstrumentedLock.check(long, long)  At 
InstrumentedLock.java:may not be atomic in 
org.apache.hadoop.hdfs.InstrumentedLock.check(long, long)  At 
InstrumentedLock.java:[line 180] |
| Failed junit tests | hadoop.hdfs.server.namenode.TestDecommissioningStatus |
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|| Subsystem || Report/Notes ||
| Docker |  Image:yetus/hadoop:9560f25 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12825168/HDFS-10742.004.patch |
| JIRA Issue | HDFS-10742 |
| Optional Tests |  asflicense  compile  javac  javadoc  mvninstall  mvnsite  
unit  findbugs  checkstyle  |
| uname | Linux 29af66f6d836 3.13.0-36-lowlatency #63-Ubuntu SMP PREEMPT Wed 
Sep 3 21:56:12 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/hadoop/patchprocess/precommit/personality/provided.sh 
|
| git revision | trunk / c37346d |
| Default Java | 1.8.0_101 |
| findbugs | v3.0.0 |
| checkstyle | 
https://builds.apache.org/job/PreCommit-HDFS-Build/16520/artifact/patchprocess/diff-checkstyle-hadoop-hdfs-project_hadoop-hdfs.txt
 |
| findbugs | 
https://builds.apache.org/job/PreCommit-HDFS-Build/16520/artifact/patchprocess/new-findbugs-hadoop-hdfs-project_hadoop-hdfs.html
 |
| unit | 
https://builds.apache.org/job/PreCommit-HDFS-Build/16520/artifact/patchprocess/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt
 |
|  Test Results | 
https://builds.apache.org/job/PreCommit-HDFS-Build/16520/testReport/ |
| modules | C: hadoop-hdfs-project/hadoop-hdfs U: 
hadoop-hdfs-project/hadoop-hdfs |
| Console output | 
https://builds.apache.org/job/PreCommit-HDFS-Build/16520/console |
| Powered by | Apache Yetus 0.4.0-SNAPSHOT   http://yetus.apache.org |


This message was automatically generated.



> Measurement of lock held time in FsDatasetImpl
> ----------------------------------------------
>
>                 Key: HDFS-10742
>                 URL: https://issues.apache.org/jira/browse/HDFS-10742
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode
>    Affects Versions: 3.0.0-alpha2
>            Reporter: Chen Liang
>            Assignee: Chen Liang
>         Attachments: HDFS-10742.001.patch, HDFS-10742.002.patch, 
> HDFS-10742.003.patch, HDFS-10742.004.patch
>
>
> This JIRA proposes to measure the time the of lock of {{FsDatasetImpl}} is 
> held by a thread. Doing so will allow us to measure lock statistics.
> This can be done by extending the {{AutoCloseableLock}} lock object in 
> {{FsDatasetImpl}}. In the future we can also consider replacing the lock with 
> a read-write lock.



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