[jira] [Resolved] (HDFS-16678) RBF supports disable getNodeUsage() in RBFMetrics

["Íñigo Goiri (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-16678?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Íñigo Goiri resolved HDFS-16678.
--------------------------------
    Fix Version/s: 3.4.0
     Hadoop Flags: Reviewed
       Resolution: Fixed

> 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
>             Fix For: 3.4.0
>
>          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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