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[SPARK-47181][CORE][TESTS] Fix `MasterSuite` to validate the number o… #7

Job	Run time
Run / Check changes	31s
Run / Protobuf breaking change detection and Python CodeGen check	1m 2s
Run / Base image build	1m 10s
Run / Run Docker integration tests	0s
Run / Build modules: core, unsafe, kvstore, avro, utils, network-common, network-shuffle, repl, launcher, examples, sketch	2m 4s
Run / Run Spark on Kubernetes Integration test	55m 32s
Run / Build modules: api, catalyst, hive-thriftserver	1m 58s
Run / Java 17 build with Maven (ubuntu-22.04)	55m 28s
Run / Build modules: mllib-local, mllib, graphx	2m 6s
Run / Run TPC-DS queries with SF=1	0s
Run / Java 21 build with Maven (ubuntu-22.04)	33m 46s
Run / Build modules: streaming, sql-kafka-0-10, streaming-kafka-0-10, streaming-kinesis-asl, kubernetes, hadoop-cloud, spark-ganglia-lgpl, protobuf	2m 10s
Run / Run Spark UI tests	18s
Run / Java 21 build with Maven (macos-14)	25m 56s
Run / Build modules: yarn, connect	2m 37s
Run / Build modules: hive - slow tests	3m 20s
Run / Build modules: hive - other tests	3m 32s
Run / Build modules: sql - extended tests	2m 8s
Run / Build modules: sql - slow tests	3m 49s
Run / Build modules: sql - other tests	4m 34s
Run / Linters, licenses, dependencies and documentation generation	38m 21s
Run / Build modules: sparkr	0s
Run / Build modules: ${{ matrix.modules }}	0s
	4h 0m 22s

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