refactor(amber, frontend): remove the never-emitted CacheStatusUpdateEvent

[aglinxinyuan]

What changes were proposed in this PR?

Deletes CacheStatusUpdateEvent. It is a websocket event the backend has not sent since the websocket cache check was removed, while the frontend kept a subscription to it. There is no behaviour change: +3/−87 lines.

Backend: the case class, its @JsonSubTypes registration, and its entries in TexeraWebSocketEventSpec.

Frontend: the interface and TexeraWebsocketEventTypeMap entry, and the subscribeToEvent("CacheStatusUpdateEvent") handler in OperatorReuseCacheStatusService with its two tests. The service's WorkflowWebsocketService dependency is removed too, because that handler was its only use.

History

Introduced by	#1328 (2021-09-08), "[Operator Caching Step 3] add operator cache backend new files and config changes". The frontend handler came in #1327 the day before
Usage removed by	#3111 (2024-11-26), "Update amber to depend on sub projects". It deleted the EditingTimeCompilationRequest branch of WorkflowWebsocketResource, the only place that called sessionState.send(CacheStatusUpdateEvent(...))

It has been dead for nearly two years. The frontend handler has been subscribed to an event that never arrives.

Reviewer note: the reuse-cache marker is unaffected. OperatorReuseCacheStatusService still repaints it through its other, live subscription (getReuseCacheOperatorsChangedStream). OperatorResultCacheStatus and JointUIService.changeOperatorReuseCacheStatus stay because that path and the editor still use them.

Any related issues, documentation, discussions?

Closes #8689

How was this PR tested?

No new tests. The protocol spec now covers only the types that remain registered, and the service spec drops the two cases for the removed handler.

Locally, from the repo root with Java 17:

• sbt "WorkflowExecutionService/Test/compile": success.
• sbt "WorkflowExecutionService/testOnly *TexeraWebSocketEventSpec": 10 tests, all pass.
• sbt "WorkflowExecutionService/scalafmtCheckAll" "WorkflowExecutionService/scalafixAll --check": clean.

From frontend/:

• npx ng test --watch=false --include='**/operator-reuse-cache-status.service.spec.ts' --include='**/workflow-websocket.service.spec.ts': 18 tests, all pass.
• yarn format:ci: clean.
• npx ng build: success.

To re-check:

git grep -n CacheStatusUpdateEvent   # no hits

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Automated Reviewer Suggestions

Based on the git blame history of the changed files, we recommend the following reviewers:

• Contributors with relevant context: @Xiao-zhen-Liu, @benjaminle22, @Ma77Ball
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[github-actions]

✅ No material benchmark regressions detected

🟢 6 better · 🔴 0 worse · ⚪ 9 noise (<±5%) · 0 without baseline

Compared against main 33bd07b benchmarked on this same runner, so the delta is largely free of cross-runner hardware noise. The "7d avg" column still reflects the gh-pages dashboard. Treat <±5% as noise unless repeated.

Dashboard · Run

	config	throughput	MB/s	latency	max Δ latest / 7d
🟢	bs=10 sw=10 sl=64	424	0.259	23,091/28,194/28,194 us	🟢 -34.4% / 🔴 +75.3%
🟢	bs=100 sw=10 sl=64	876	0.535	114,179/126,747/126,747 us	🟢 -12.6% / 🔴 +13.0%
⚪	bs=1000 sw=10 sl=64	1,012	0.618	981,461/1,038,945/1,038,945 us	⚪ within ±5% / 🟢 -5.8%

Baseline details

Latest main 33bd07b from same runner

config	metric	PR	latest main	7d avg	Δ latest	Δ 7d
bs=10 sw=10 sl=64	throughput	424 tuples/sec	397 tuples/sec	736.99 tuples/sec	+6.8%	-42.5%
bs=10 sw=10 sl=64	MB/s	0.259 MB/s	0.242 MB/s	0.45 MB/s	+7.0%	-42.4%
bs=10 sw=10 sl=64	p50	23,091 us	23,837 us	13,174 us	-3.1%	+75.3%
bs=10 sw=10 sl=64	p95	28,194 us	42,993 us	16,900 us	-34.4%	+66.8%
bs=10 sw=10 sl=64	p99	28,194 us	42,993 us	19,889 us	-34.4%	+41.8%
bs=100 sw=10 sl=64	throughput	876 tuples/sec	894 tuples/sec	946.47 tuples/sec	-2.0%	-7.4%
bs=100 sw=10 sl=64	MB/s	0.535 MB/s	0.546 MB/s	0.578 MB/s	-2.0%	-7.4%
bs=100 sw=10 sl=64	p50	114,179 us	108,953 us	105,257 us	+4.8%	+8.5%
bs=100 sw=10 sl=64	p95	126,747 us	145,004 us	112,150 us	-12.6%	+13.0%
bs=100 sw=10 sl=64	p99	126,747 us	145,004 us	125,962 us	-12.6%	+0.6%
bs=1000 sw=10 sl=64	throughput	1,012 tuples/sec	1,016 tuples/sec	973.64 tuples/sec	-0.4%	+3.9%
bs=1000 sw=10 sl=64	MB/s	0.618 MB/s	0.62 MB/s	0.594 MB/s	-0.3%	+4.0%
bs=1000 sw=10 sl=64	p50	981,461 us	978,935 us	1,032,217 us	+0.3%	-4.9%
bs=1000 sw=10 sl=64	p95	1,038,945 us	1,029,563 us	1,072,497 us	+0.9%	-3.1%
bs=1000 sw=10 sl=64	p99	1,038,945 us	1,029,563 us	1,102,623 us	+0.9%	-5.8%

Raw CSV

config_idx,batch_size,schema_width,string_len,num_batches,total_ms,total_tuples,total_bytes,tuples_per_sec,mb_per_sec,lat_p50_us,lat_p95_us,lat_p99_us
0,10,10,64,20,471.41,200,128000,424,0.259,23091.20,28194.27,28194.27
1,100,10,64,20,2283.12,2000,1280000,876,0.535,114178.93,126747.43,126747.43
2,1000,10,64,20,19753.59,20000,12800000,1012,0.618,981461.48,1038944.56,1038944.56

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.72%. Comparing base (33bd07b) to head (8e291ba).

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #8690      +/-   ##
============================================
- Coverage     92.72%   92.72%   -0.01%     
+ Complexity     4947     4946       -1     
============================================
  Files          1243     1242       -1     
  Lines         52682    52672      -10     
  Branches       6520     6519       -1     
============================================
- Hits          48850    48840      -10     
  Misses         2214     2214              
  Partials       1618     1618              

Flag	Coverage Δ		*Carryforward flag
access-control-service	77.38% <ø> (ø)		Carriedforward from 33bd07b
agent-service	99.16% <ø> (ø)		Carriedforward from 33bd07b
amber	88.46% <ø> (+<0.01%)	⬆️
computing-unit-managing-service	60.41% <ø> (ø)		Carriedforward from 33bd07b
config-service	87.37% <ø> (ø)		Carriedforward from 33bd07b
file-service	81.53% <ø> (ø)		Carriedforward from 33bd07b
frontend	96.52% <100.00%> (-0.01%)	⬇️
notebook-migration-service	83.73% <ø> (ø)		Carriedforward from 33bd07b
pyamber	98.56% <ø> (ø)		Carriedforward from 33bd07b
workflow-compiling-service	74.09% <ø> (ø)		Carriedforward from 33bd07b

*This pull request uses carry forward flags. Click here to find out more.

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