Andrew Wang commented on HDFS-8411:

I think generally, more metrics are useful. HDFS-8529 I just closed as a dupe 
since we have task-level metrics, but HDFS-8410 and this JIRA are nice since it 
indicates whether the bottleneck is I/O or CPU.

I also like this bytes-read metric a lot. It'd be nice to have a similar metric 
for replication work if we don't, as well as a "total" metric that includes 

> Add bytes count metrics to datanode for ECWorker
> ------------------------------------------------
>                 Key: HDFS-8411
>                 URL: https://issues.apache.org/jira/browse/HDFS-8411
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Li Bo
>            Assignee: Li Bo
>         Attachments: HDFS-8411-001.patch, HDFS-8411-002.patch, 
> HDFS-8411-003.patch
> This is a sub task of HDFS-7674. It calculates the amount of data that is 
> read from local or remote to attend decoding work, and also the amount of 
> data that is written to local or remote datanodes.

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