[jira] [Updated] (FLINK-16864) Add idle metrics for Task

["Piotr Nowojski (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-16864?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Piotr Nowojski updated FLINK-16864:
-----------------------------------
    Component/s: Runtime / Metrics

> Add idle metrics for Task
> -------------------------
>
>                 Key: FLINK-16864
>                 URL: https://issues.apache.org/jira/browse/FLINK-16864
>             Project: Flink
>          Issue Type: Improvement
>          Components: Runtime / Metrics, Runtime / Task
>            Reporter: Wenlong Lyu
>            Priority: Major
>
> Currently there is no metric for user to measure how busy a task is concretely, which is important for user to decide how to tune a job.
> We would like to propose adding an IdleTime which measure idle time of a task including the time cost for mail processor to wait for new mail and the time cost in record writer to waiting a new buffer. 
> With the idle time:
> 1. when a job can not catch up with the speed of data generating, the vertex which idle time is near to zero is the bottle neck of the job.
> 2. when a job is not busy, idle time  can be used to guide user how much he can scale down the job.
> In addition, measuring idle time can have little impaction on the performance of the job, because when a task is busy, we don't touch the code to measure wait-time in mailbox.



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