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

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HDFS-16917?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17688856#comment-17688856 ] 

ASF GitHub Bot commented on HDFS-16917:
---------------------------------------

rdingankar opened a new pull request, #5397:
URL: https://github.com/apache/hadoop/pull/5397

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   ### Description of PR
   Transfer rate metric for datanode reads will be calculated as the rate at which bytes are read ( bytes per ms )
   With quantiles we will get a distribution of this rate which will be helpful in identifying slow datanodes.
   
   
   ### How was this patch tested?
   
   
   ### For code changes:
   
   - [ Y] Does the title or this PR starts with the corresponding JIRA issue id (e.g. 'HADOOP-17799. Your PR title ...')?
   - [ NA] Object storage: have the integration tests been executed and the endpoint declared according to the connector-specific documentation?
   - [ NA] If adding new dependencies to the code, are these dependencies licensed in a way that is compatible for inclusion under [ASF 2.0](http://www.apache.org/legal/resolved.html#category-a)?
   - [ NA] If applicable, have you updated the `LICENSE`, `LICENSE-binary`, `NOTICE-binary` files?
   
   




> 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
>            Reporter: Ravindra Dingankar
>            Priority: Minor
>
> 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 distribution of data transfer rate for datanode reads.
>  



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