[jira] [Created] (FLINK-14127) Better BackPressure Detection in WebUI

[Shang Yuanchun (Jira)]

Yadong Xie created FLINK-14127:
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             Summary: Better BackPressure Detection in WebUI
                 Key: FLINK-14127
                 URL: https://issues.apache.org/jira/browse/FLINK-14127
             Project: Flink
          Issue Type: Improvement
          Components: Runtime / Web Frontend
    Affects Versions: 1.10.0
            Reporter: Yadong Xie
             Fix For: 1.10.0
         Attachments: 屏幕快照 2019-09-19 下午6.00.05.png, 屏幕快照 2019-09-19 下午6.00.57.png, 屏幕快照 2019-09-19 下午6.01.43.png

According to the [Document|https://ci.apache.org/projects/flink/flink-docs-release-1.9/monitoring/back_pressure.html], the backpressure monitor only triggered on request and it is currently not available via metrics. This means that in the web UI we have no way to show all the backpressure state of all vertexes at the same time. The users need to click every vertex to get its backpressure state.

!屏幕快照 2019-09-19 下午6.00.05.png|width=510,height=197!

In Flink 1.9.0 and above, there are four metrics available(outPoolUsage, inPoolUsage, floatingBuffersUsage, exclusiveBuffersUsage), we can use these metrics to determine if there are possible backpressure, and then use the backpressure REST API to confirm it.

Here is a table get from [https://flink.apache.org/2019/07/23/flink-network-stack-2.html]

!屏幕快照 2019-09-19 下午6.00.57.png|width=516,height=304!

 

We can display the possible backpressure status on the vertex graph, thus users can get all the vertex backpressure states and locate the potential problem quickly.

 

!屏幕快照 2019-09-19 下午6.01.43.png|width=572,height=277!



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