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https://issues.apache.org/jira/browse/HADOOP-12908?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15799455#comment-15799455
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Hadoop QA commented on HADOOP-12908:
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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
0s{color} | {color:blue} Docker mode activated. {color} |
| {color:red}-1{color} | {color:red} patch {color} | {color:red} 0m 4s{color}
| {color:red} HADOOP-12908 does not apply to trunk. Rebase required? Wrong
Branch? See https://wiki.apache.org/hadoop/HowToContribute for help. {color} |
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|| Subsystem || Report/Notes ||
| JIRA Issue | HADOOP-12908 |
| JIRA Patch URL |
https://issues.apache.org/jira/secure/attachment/12794331/HADOOP-12908-003.patch
|
| Console output |
https://builds.apache.org/job/PreCommit-HADOOP-Build/11363/console |
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This message was automatically generated.
> Make JvmPauseMonitor a singleton
> --------------------------------
>
> Key: HADOOP-12908
> URL: https://issues.apache.org/jira/browse/HADOOP-12908
> Project: Hadoop Common
> Issue Type: Improvement
> Affects Versions: 2.7.2
> Reporter: John Zhuge
> Assignee: John Zhuge
> Priority: Minor
> Attachments: HADOOP-12908-001.patch, HADOOP-12908-002.patch,
> HADOOP-12908-003.patch
>
>
> Make JvmPauseMonitor a singleton just as JvmMetrics because there is no use
> case to run multiple instances per JVM. {{TestMetrics$setPauseMonitor}}
> becomes obsolete. Initialization code for various components can be
> simplified.
> For example, this code segment
> {code}
> pauseMonitor = new JvmPauseMonitor();
> addService(pauseMonitor);
> jm.setPauseMonitor(pauseMonitor);
> {code}
> can be replaced with
> {code}
> addService(JvmPauseMonitor.getInstance());
> {code}
> And this code segment
> {code}
> pauseMonitor = new JvmPauseMonitor();
> pauseMonitor.init(config);
> pauseMonitor.start();
> metrics.getJvmMetrics().setPauseMonitor(pauseMonitor);
> {code}
> can be replaced with
> {code}
> pauseMonitor = JvmPauseMonitor.getInstance();
> pauseMonitor.init(config);
> pauseMonitor.start();
> {code}
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