Arpit Agarwal commented on HDFS-13055:

Thanks for updating the patch [~ajayydv]. I have not reviewed the complete 
patch, but I've posted a few early comments in the ReviewBoard.

> Aggregate usage statistics from datanodes
> -----------------------------------------
>                 Key: HDFS-13055
>                 URL: https://issues.apache.org/jira/browse/HDFS-13055
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Ajay Kumar
>            Assignee: Ajay Kumar
>            Priority: Major
>         Attachments: HDFS-13055.001.patch, HDFS-13055.002.patch, 
> HDFS-13055.003.patch, HDFS-13055.004.patch, HDFS-13055.005.patch, 
> HDFS-13055.006.patch
> We collect variety of statistics in DataNodes and expose them via JMX. 
> Aggregating some of the high level statistics which we are already collecting 
> in {{DataNodeMetrics}} (like bytesRead,bytesWritten etc) over a configurable 
> time window will create a central repository accessible via JMX and UI.

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