Purushottam Sinha created FLINK-41308:
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Summary: Web dashboard: TaskManager Metrics "Netty Shuffle
Buffers" Available/Total are always blank
Key: FLINK-41308
URL: https://issues.apache.org/jira/browse/FLINK-41308
Project: Flink
Issue Type: Bug
Components: Runtime / Web Frontend
Affects Versions: 2.0.0, 2.2.0, 2.3.0, 2.1.0
Reporter: Purushottam Sinha
*Problem*
Since 2.0.0, the Available and Total cells in the TaskManager Metrics page's
Netty Shuffle Buffers table are empty. Users can't see shuffle buffer counts in
the UI.
*Evidence*
* {{task-manager-metrics.component.html:258,262}} reads
{{metrics.memorySegmentsAvailable}} / {{memorySegmentsTotal}}. FLINK-36355
removed both fields from {{TaskManagerMetricsInfo}}. REST now returns
{{nettyShuffleMemorySegmentsAvailable}} / {{Used}} / {{Total}} instead.
* On master with a standalone cluster, {{GET /taskmanagers/<id>}} returns
4096/4096 while both UI cells are blank.
* The tests didn't catch this because the spec mock still uses the old field
names. FLINK-36355 removed the old fields from {{interfaces/task-manager.ts}}
but didn't add the new ones.
*Proposed fix*
* Read {{nettyShuffleMemorySegmentsAvailable}} /
{{nettyShuffleMemorySegmentsTotal}} in the template.
* Add both fields to the {{Metrics}} interface in
{{interfaces/task-manager.ts}}.
* Update the spec mock and add a test that checks the rendered counts.
*Acceptance*
* The TM Metrics page shows the same Available/Total values as {{GET
/taskmanagers/<id>}}.
* The new spec test fails without the template fix and passes with it.
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