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https://issues.apache.org/jira/browse/HDFS-6982?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jing Zhao updated HDFS-6982:
----------------------------
    Assignee: Maysam Yabandeh

> nntop: top­-like tool for name node users
> -----------------------------------------
>
>                 Key: HDFS-6982
>                 URL: https://issues.apache.org/jira/browse/HDFS-6982
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>            Reporter: Maysam Yabandeh
>            Assignee: Maysam Yabandeh
>         Attachments: HDFS-6982.patch, nntop-design-v1.pdf
>
>
> In this jira we motivate the need for nntop, a tool that, similarly to what 
> top does in Linux, gives the list of top users of the HDFS name node and 
> gives insight about which users are sending majority of each traffic type to 
> the name node. This information turns out to be the most critical when the 
> name node is under pressure and the HDFS admin needs to know which user is 
> hammering the name node and with what kind of requests. Here we present the 
> design of nntop which has been in production at Twitter in the past 10 
> months. nntop proved to have low cpu overhead (< 2% in a cluster of 4K 
> nodes), low memory footprint (less than a few MB), and quite efficient for 
> the write path (only two hash lookup for updating a metric).



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