[jira] [Updated] (HDFS-16917) Add transfer rate quantile metrics for DataNode reads

["Shilun Fan (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-16917?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Shilun Fan updated HDFS-16917:
------------------------------
         Hadoop Flags: Reviewed
     Target Version/s: 3.3.0, 3.4.0
    Affects Version/s: 3.3.0
                       3.4.0

> Add transfer rate quantile metrics for DataNode reads
> -----------------------------------------------------
>
>                 Key: HDFS-16917
>                 URL: https://issues.apache.org/jira/browse/HDFS-16917
>             Project: Hadoop HDFS
>          Issue Type: Task
>          Components: datanode
>    Affects Versions: 3.3.0, 3.4.0
>            Reporter: Ravindra Dingankar
>            Assignee: Ravindra Dingankar
>            Priority: Minor
>              Labels: pull-request-available
>             Fix For: 3.3.0, 3.4.0
>
>
> Currently we have the following metrics for datanode reads.
> |BytesRead
> BlocksRead
> TotalReadTime|Total number of bytes read from DataNode
> Total number of blocks read from DataNode
> Total number of milliseconds spent on read operation|
> We would like to add a new quantile metric calculating the transfer rate for datanode reads.
> This will give us a distribution across a window of the read transfer rate for each datanode.
> Quantiles for transfer rate per host will help in identifying issues like hotspotting of datasets as well as finding repetitive slow datanodes.
>  



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