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https://issues.apache.org/jira/browse/HDFS-16678?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17577644#comment-17577644
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ASF GitHub Bot commented on HDFS-16678:
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goiri commented on PR #4606:
URL: https://github.com/apache/hadoop/pull/4606#issuecomment-1209932600
@slfan1989 please take another look
> RBF supports disable getNodeUsage() in RBFMetrics
> -------------------------------------------------
>
> Key: HDFS-16678
> URL: https://issues.apache.org/jira/browse/HDFS-16678
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: ZanderXu
> Assignee: ZanderXu
> Priority: Major
> Labels: pull-request-available
> Time Spent: 2h
> Remaining Estimate: 0h
>
> In our prod environment, we try to collect RBF metrics every 15s through
> jmx_exporter. And we found that collection task often failed.
> After tracing and found that the collection task is blocked at getNodeUsage()
> in RBFMetrics, because it will collection all datanode's usage from
> downstream nameservices. This is a very expensive and almost useless
> operation. Because in most scenarios, each NameSerivce contains almost the
> same DNs. We can get the data usage's from any one nameservices, not from RBF.
> So I feel that RBF should supports disable getNodeUsage() in RBFMetrics.
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