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Add the scheduling module

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Three replicas of one application against one PostgreSQL database, proving
duplicate @Scheduled execution and then removing it with ShedLock: 24
executions where 8 were due, then 7 for 7 ticks.

Also measured: @SchedulerLock without @EnableSchedulerLock does nothing and
warns about nothing; spring.task.scheduling.pool.size=1 does not starve a
fixedRate job but delays it and fires 35 of 40 executions in a burst; and a
node whose clock is 40 seconds fast takes a live lock unless the provider
uses usingDbTime().
This commit is contained in:
Ankur Mhatre
2026-09-01 23:28:06 +05:30
parent 9b3fe88813
commit eaa8171966
31 changed files with 1373 additions and 1 deletions
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8
scheduling/docs/output/tests.txt Normal file
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[INFO] Running com.ankurm.scheduling.SingleSchedulerThreadTest
[INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 10.10 s -- in com.ankurm.scheduling.SingleSchedulerThreadTest
[INFO] Running com.ankurm.scheduling.LargerSchedulerPoolTest
[INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 9.422 s -- in com.ankurm.scheduling.LargerSchedulerPoolTest
[INFO] Running com.ankurm.scheduling.ClockSkewTest
[INFO] Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 5.964 s -- in com.ankurm.scheduling.ClockSkewTest
[INFO] Tests run: 4, Failures: 0, Errors: 0, Skipped: 0
[INFO] BUILD SUCCESS