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Posted to hdfs-dev@hadoop.apache.org by "Íñigo Goiri (Jira)" <ji...@apache.org> on 2023/04/18 17:50:00 UTC

[jira] [Resolved] (HDFS-16982) Use the right Quantiles Array for Inverse Quantiles snapshot

     [ https://issues.apache.org/jira/browse/HDFS-16982?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Íñigo Goiri resolved HDFS-16982.
--------------------------------
    Fix Version/s:     (was: 3.3.0)
     Hadoop Flags: Reviewed
       Resolution: Fixed

> Use the right Quantiles Array for Inverse Quantiles snapshot 
> -------------------------------------------------------------
>
>                 Key: HDFS-16982
>                 URL: https://issues.apache.org/jira/browse/HDFS-16982
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: datanode, metrics
>            Reporter: Ravindra Dingankar
>            Priority: Minor
>              Labels: pull-request-available
>             Fix For: 3.4.0
>
>
> HDFS-16949 introduced InverseQuantiles. However during snapshot for Inverse Quantiles we were still trying to access values from previous snapshot based on the Quantile Array declared in MutableQuantiles. ( Quantile(.50, .050), Quantile(.75, .025), Quantile(.90, .010), Quantile(.95, .005), Quantile(.99, .001) )
> For InverseQuantiles we wont have these values ( except for Quantile(.50, .050) ) thus except for 50 Percentile snapshot wont return any value for the remaining quantiles.
> Fix is to use the correct Quantiles Array to retrieve values during snapshot. The new UTs verify this behavior.



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