[jira] [Work started] (HDFS-8874) Add DN metrics for balancer and other block movement scenarios

["Chris Trezzo (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-8874?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on HDFS-8874 started by Chris Trezzo.
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> Add DN metrics for balancer and other block movement scenarios
> --------------------------------------------------------------
>
>                 Key: HDFS-8874
>                 URL: https://issues.apache.org/jira/browse/HDFS-8874
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Ming Ma
>            Assignee: Chris Trezzo
>
> For balancer, mover and migrator (HDFS-8789), we want to know how close it is to the DN's throttling thresholds. Although DN has existing metrics such as {{BytesWritten}}, {{BytesRead}}, {{CopyBlockOpNumOps}} and {{ReplaceBlockOpNumOps}}, there is no metrics to indicate the number of bytes moved.
> We can add {{ReplaceBlockBytesWritten}} and {{CopyBlockBytesRead}} to account for the bytes moved in ReplaceBlock and CopyBlock operations. In addition, we can also add throttling metrics for {{DataTransferThrottler}} and {{BlockBalanceThrottler}}.



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