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https://issues.apache.org/jira/browse/HDFS-15963?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17318747#comment-17318747
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Hadoop QA commented on HDFS-15963:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime ||  Logfile || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 14m 
23s{color} | {color:blue}{color} | {color:blue} Docker mode activated. {color} |
|| || || || {color:brown} Prechecks {color} || ||
| {color:green}+1{color} | {color:green} dupname {color} | {color:green}  0m  
0s{color} | {color:green}{color} | {color:green} No case conflicting files 
found. {color} |
| {color:green}+1{color} | {color:green} @author {color} | {color:green}  0m  
0s{color} | {color:green}{color} | {color:green} The patch does not contain any 
@author tags. {color} |
| {color:green}+1{color} | {color:green} {color} | {color:green}  0m  0s{color} 
| {color:green}test4tests{color} | {color:green} The patch appears to include 3 
new or modified test files. {color} |
|| || || || {color:brown} trunk Compile Tests {color} || ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 20m 
15s{color} | {color:green}{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m 
21s{color} | {color:green}{color} | {color:green} trunk passed with JDK 
Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04 {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m 
17s{color} | {color:green}{color} | {color:green} trunk passed with JDK Private 
Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08 {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  1m 
 7s{color} | {color:green}{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  1m 
21s{color} | {color:green}{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
15m 36s{color} | {color:green}{color} | {color:green} branch has no errors when 
building and testing our client artifacts. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
52s{color} | {color:green}{color} | {color:green} trunk passed with JDK 
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| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m 
24s{color} | {color:green}{color} | {color:green} trunk passed with JDK Private 
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| {color:blue}0{color} | {color:blue} spotbugs {color} | {color:blue} 20m 
54s{color} | {color:blue}{color} | {color:blue} Both FindBugs and SpotBugs are 
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| {color:green}+1{color} | {color:green} spotbugs {color} | {color:green}  3m  
2s{color} | {color:green}{color} | {color:green} trunk passed {color} |
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| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  1m 
12s{color} | {color:green}{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m 
11s{color} | {color:green}{color} | {color:green} the patch passed with JDK 
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| {color:green}+1{color} | {color:green} javac {color} | {color:green}  1m 
11s{color} | {color:green}{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m  
6s{color} | {color:green}{color} | {color:green} the patch passed with JDK 
Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  1m  
6s{color} | {color:green}{color} | {color:green} the patch passed {color} |
| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange}  
0m 58s{color} | 
{color:orange}https://ci-hadoop.apache.org/job/PreCommit-HDFS-Build/568/artifact/out/diff-checkstyle-hadoop-hdfs-project_hadoop-hdfs.txt{color}
 | {color:orange} hadoop-hdfs-project/hadoop-hdfs: The patch generated 2 new + 
242 unchanged - 0 fixed = 244 total (was 242) {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  1m 
11s{color} | {color:green}{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} whitespace {color} | {color:green}  0m 
 0s{color} | {color:green}{color} | {color:green} The patch has no whitespace 
issues. {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
13m  3s{color} | {color:green}{color} | {color:green} patch has no errors when 
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| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
51s{color} | {color:green}{color} | {color:green} the patch passed with JDK 
Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m 
30s{color} | {color:green}{color} | {color:green} the patch passed with JDK 
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| {color:green}+1{color} | {color:green} spotbugs {color} | {color:green}  3m 
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|| || || || {color:brown} Other Tests {color} || ||
| {color:red}-1{color} | {color:red} unit {color} | {color:red}237m 32s{color} 
| 
{color:red}https://ci-hadoop.apache.org/job/PreCommit-HDFS-Build/568/artifact/out/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt{color}
 | {color:red} hadoop-hdfs in the patch passed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
46s{color} | {color:green}{color} | {color:green} The patch does not generate 
ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black}323m 53s{color} | 
{color:black}{color} | {color:black}{color} |
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|| Reason || Tests ||
| Failed junit tests | hadoop.hdfs.server.datanode.TestDirectoryScanner |
|   | hadoop.hdfs.server.blockmanagement.TestUnderReplicatedBlocks |
|   | hadoop.hdfs.qjournal.server.TestJournalNodeRespectsBindHostKeys |
|   | hadoop.fs.viewfs.TestViewFsLinkFallback |
|   | hadoop.hdfs.server.namenode.snapshot.TestNestedSnapshots |
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|| Subsystem || Report/Notes ||
| Docker | ClientAPI=1.41 ServerAPI=1.41 base: 
https://ci-hadoop.apache.org/job/PreCommit-HDFS-Build/568/artifact/out/Dockerfile
 |
| JIRA Issue | HDFS-15963 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/13023670/HDFS-15963.003.patch |
| Optional Tests | dupname asflicense compile javac javadoc mvninstall mvnsite 
unit shadedclient findbugs checkstyle spotbugs |
| uname | Linux a6ad97b14093 4.15.0-112-generic #113-Ubuntu SMP Thu Jul 9 
23:41:39 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | personality/hadoop.sh |
| git revision | trunk / 6a9a5ae5fdc |
| Default Java | Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08 |
| Multi-JDK versions | 
/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04 
/usr/lib/jvm/java-8-openjdk-amd64:Private 
Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08 |
|  Test Results | 
https://ci-hadoop.apache.org/job/PreCommit-HDFS-Build/568/testReport/ |
| Max. process+thread count | 2909 (vs. ulimit of 5500) |
| modules | C: hadoop-hdfs-project/hadoop-hdfs U: 
hadoop-hdfs-project/hadoop-hdfs |
| Console output | 
https://ci-hadoop.apache.org/job/PreCommit-HDFS-Build/568/console |
| versions | git=2.25.1 maven=3.6.3 spotbugs=4.2.2 |
| Powered by | Apache Yetus 0.13.0-SNAPSHOT https://yetus.apache.org |


This message was automatically generated.



> Unreleased volume references cause an infinite loop
> ---------------------------------------------------
>
>                 Key: HDFS-15963
>                 URL: https://issues.apache.org/jira/browse/HDFS-15963
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: datanode
>            Reporter: Shuyan Zhang
>            Assignee: Shuyan Zhang
>            Priority: Major
>              Labels: pull-request-available
>         Attachments: HDFS-15963.001.patch, HDFS-15963.002.patch, 
> HDFS-15963.003.patch
>
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
>
> When BlockSender throws an exception because the meta-data cannot be found, 
> the volume reference obtained by the thread is not released, which causes the 
> thread trying to remove the volume to wait and fall into an infinite loop.
> {code:java}
> boolean checkVolumesRemoved() {
>   Iterator<FsVolumeImpl> it = volumesBeingRemoved.iterator();
>   while (it.hasNext()) {
>     FsVolumeImpl volume = it.next();
>     if (!volume.checkClosed()) {
>       return false;
>     }
>     it.remove();
>   }
>   return true;
> }
> boolean checkClosed() {
>   // always be true.
>   if (this.reference.getReferenceCount() > 0) {
>     FsDatasetImpl.LOG.debug("The reference count for {} is {}, wait to be 0.",
>         this, reference.getReferenceCount());
>     return false;
>   }
>   return true;
> }
> {code}
> At the same time, because the thread has been holding checkDirsLock when 
> removing the volume, other threads trying to acquire the same lock will be 
> permanently blocked.
> Similar problems also occur in RamDiskAsyncLazyPersistService and 
> FsDatasetAsyncDiskService.
> This patch releases the three previously unreleased volume references.



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