elon_X created FLINK-35160:
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Summary: Support for Thread Dump provides a convenient way to
display issues of thread deadlocks in tasks
Key: FLINK-35160
URL: https://issues.apache.org/jira/browse/FLINK-35160
Project: Flink
Issue Type: Improvement
Components: Runtime / REST
Affects Versions: 1.18.1, 1.19.0, 1.17.1, 1.16.0
Reporter: elon_X
Attachments: image-2024-04-18-20-57-52-440.png,
image-2024-04-18-20-58-09-872.png, image-2024-04-18-21-00-04-532.png,
image-2024-04-18-21-01-22-881.png, image-2024-04-18-21-34-41-014.png
After receiving feedback from the business side about performance issues in
their tasks, we attempted to troubleshoot and discovered that their tasks had
issues with thread deadlocks. However, the Thread Dump entry on the Flink page
only shows thread stacks. Since the users are not very familiar with Java
stacks, they couldn't clearly identify that the deadlocks were due to issues in
the business logic code and mistakenly thought they were problems with the
Flink framework
!image-2024-04-18-20-57-52-440.png!
!image-2024-04-18-20-58-09-872.png!
the JVM's jstack command can clearly display thread deadlocks, unfortunately,
the business team does not have the permissions to log into the machines. hear
is the jstack log
!image-2024-04-18-21-00-04-532.png!
FlameGraph are excellent for visualizing performance bottlenecks and hotspots
in application profiling but are not designed to pinpoint the exact lines of
code where thread deadlocks occur.
!image-2024-04-18-21-01-22-881.png!
Perhaps we could enhance the Thread Dump feature to display thread deadlocks,
similar to what the {{jstack}} command provides.
!image-2024-04-18-21-34-41-014.png!
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