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https://issues.apache.org/jira/browse/HADOOP-10169?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13850209#comment-13850209
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Jing Zhao commented on HADOOP-10169:
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Is it possible that multiple threads call getMetrics(MetricsCollector, boolean)
around the same time, which causes getGcInfo to be called concurrently? In that
case, we still need the synchronized here?
> remove the unnecessary synchronized in JvmMetrics class
> --------------------------------------------------------
>
> Key: HADOOP-10169
> URL: https://issues.apache.org/jira/browse/HADOOP-10169
> Project: Hadoop Common
> Issue Type: Improvement
> Components: metrics
> Affects Versions: 3.0.0, 2.2.0
> Reporter: Liang Xie
> Assignee: Liang Xie
> Priority: Minor
> Attachments: HADOOP-10169.txt
>
>
> When i looked into a HBase JvmMetric impl, just found this synchronized seems
> not essential.
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