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https://issues.apache.org/jira/browse/HDFS-15273?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17511194#comment-17511194
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Hadoop QA commented on HDFS-15273:
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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} 13m 
17s{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:red}-1{color} | {color:red} test4tests {color} | {color:red}  0m  
0s{color} | {color:red}{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} 22m 
56s{color} | {color:green}{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m 
30s{color} | {color:green}{color} | {color:green} trunk passed with JDK 
Ubuntu-11.0.14+9-Ubuntu-0ubuntu2.20.04 {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m 
22s{color} | {color:green}{color} | {color:green} trunk passed with JDK Private 
Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07 {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  1m 
 0s{color} | {color:green}{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  1m 
28s{color} | {color:green}{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
23m 21s{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}  1m  
0s{color} | {color:green}{color} | {color:green} trunk passed with JDK 
Ubuntu-11.0.14+9-Ubuntu-0ubuntu2.20.04 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m 
29s{color} | {color:green}{color} | {color:green} trunk passed with JDK Private 
Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07 {color} |
| {color:blue}0{color} | {color:blue} spotbugs {color} | {color:blue} 29m 
18s{color} | {color:blue}{color} | {color:blue} Both FindBugs and SpotBugs are 
enabled, using SpotBugs. {color} |
| {color:green}+1{color} | {color:green} spotbugs {color} | {color:green}  3m 
27s{color} | {color:green}{color} | {color:green} trunk passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} || ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  1m 
23s{color} | {color:green}{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m 
19s{color} | {color:green}{color} | {color:green} the patch passed with JDK 
Ubuntu-11.0.14+9-Ubuntu-0ubuntu2.20.04 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  1m 
19s{color} | {color:green}{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m 
17s{color} | {color:green}{color} | {color:green} the patch passed with JDK 
Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  1m 
17s{color} | {color:green}{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
58s{color} | {color:green}{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  1m 
21s{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} xml {color} | {color:green}  0m  
2s{color} | {color:green}{color} | {color:green} The patch has no ill-formed 
XML file. {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
21m 33s{color} | {color:green}{color} | {color:green} patch has no errors when 
building and testing our client artifacts. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
59s{color} | {color:green}{color} | {color:green} the patch passed with JDK 
Ubuntu-11.0.14+9-Ubuntu-0ubuntu2.20.04 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m 
31s{color} | {color:green}{color} | {color:green} the patch passed with JDK 
Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07 {color} |
| {color:green}+1{color} | {color:green} spotbugs {color} | {color:green}  3m 
35s{color} | {color:green}{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} || ||
| {color:red}-1{color} | {color:red} unit {color} | {color:red}239m  7s{color} 
| 
{color:red}https://ci-hadoop.apache.org/job/PreCommit-HDFS-Build/778/artifact/out/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt{color}
 | {color:red} hadoop-hdfs in the patch failed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
41s{color} | {color:green}{color} | {color:green} The patch does not generate 
ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black}345m 25s{color} | 
{color:black}{color} | {color:black}{color} |
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|| Subsystem || Report/Notes ||
| Docker | ClientAPI=1.41 ServerAPI=1.41 base: 
https://ci-hadoop.apache.org/job/PreCommit-HDFS-Build/778/artifact/out/Dockerfile
 |
| JIRA Issue | HDFS-15273 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/13041452/HDFS-15273.003.patch |
| Optional Tests | dupname asflicense compile javac javadoc mvninstall mvnsite 
unit shadedclient spotbugs checkstyle xml |
| uname | Linux d12ab82787ab 4.15.0-156-generic #163-Ubuntu SMP Thu Aug 19 
23:31:58 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | dev-support/bin/hadoop.sh |
| git revision | trunk / 45ce1cce50c |
| Default Java | Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07 |
| Multi-JDK versions | 
/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.14+9-Ubuntu-0ubuntu2.20.04 
/usr/lib/jvm/java-8-openjdk-amd64:Private 
Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07 |
|  Test Results | 
https://ci-hadoop.apache.org/job/PreCommit-HDFS-Build/778/testReport/ |
| Max. process+thread count | 3276 (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/778/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.



> CacheReplicationMonitor hold lock for long time and lead to NN out of service
> -----------------------------------------------------------------------------
>
>                 Key: HDFS-15273
>                 URL: https://issues.apache.org/jira/browse/HDFS-15273
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: caching, namenode
>            Reporter: Xiaoqiao He
>            Assignee: Xiaoqiao He
>            Priority: Major
>         Attachments: HDFS-15273.001.patch, HDFS-15273.002.patch, 
> HDFS-15273.003.patch
>
>
> CacheReplicationMonitor scan Cache Directives and Cached BlockMap 
> periodically. If we add more and more cache directives, 
> CacheReplicationMonitor will cost very long time to rescan all of cache 
> directives and cache blocks. Meanwhile, scan operation hold global write 
> lock, during scan period, NameNode could not process other request.
> So I think we should warn this risk to end user who turn on CacheManager 
> feature before improve this implement.
> {code:java}
>   private void rescan() throws InterruptedException {
>     scannedDirectives = 0;
>     scannedBlocks = 0;
>     try {
>       namesystem.writeLock();
>       try {
>         lock.lock();
>         if (shutdown) {
>           throw new InterruptedException("CacheReplicationMonitor was " +
>               "shut down.");
>         }
>         curScanCount = completedScanCount + 1;
>       } finally {
>         lock.unlock();
>       }
>       resetStatistics();
>       rescanCacheDirectives();
>       rescanCachedBlockMap();
>       blockManager.getDatanodeManager().resetLastCachingDirectiveSentTime();
>     } finally {
>       namesystem.writeUnlock();
>     }
>   }
> {code}



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