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Yarn web UI explanation

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Yarn web UI explanation

Is there any detail explanation of Yarn UI and stats it is showing?

I observed a scenario where only one job is running in queue A. When I check job on YARN UI (RUNNING page) it shows 75% of the queue A is used. But when I check queue usage, then UI shows queue A is using 15%(yarn scheduler page).

I am confused because of this. am I missing anything here?

Is there any wiki/doc about YARN UI, which I can refer?

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