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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