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Worker called multiply times and very often

See original GitHub issue

I Use version 1.0.0-alpha10 of worker lib.

I create simple worker implementation -

class CacheWorker(context: Context, workerParameters: WorkerParameters) : Worker(context, workerParameters) {
    override fun doWork(): Result {
        Log.d(CacheWorker::class.java.simpleName, "doWork() called")
        val cacheUseCase = UseCaseCacheAssembly.provide(applicationContext)
        try {
            cacheUseCase.sendCachedRequests()
        } catch (e: Exception) {
        }
        return Result.SUCCESS
    }
}

it should periodically start if there is Internet connection and try to send cached data from app. If there is any error - no problem, we just wait when worker starts again and try to send.

Here is code of starting worker:

fun startCashWorker() {
        val constraints = Constraints.Builder()
            .setRequiredNetworkType(NetworkType.CONNECTED)
            .build()

        val cashWorkRequest =
            PeriodicWorkRequest.Builder(CacheWorker::class.java, 15, TimeUnit.MINUTES)
                .setConstraints(constraints)
                .build()

        WorkManager.getInstance().enqueueUniquePeriodicWork(
            "caching",
            ExistingPeriodicWorkPolicy.REPLACE,
            cashWorkRequest
        )
    }

This function called once on start of app.

But when internet is on, worker called VERY MANY times, just look at logs of method ‘doCall’ (more then 10 times at the moment and next calls is after only one minute (not 15 minutes as it created in code):

10-29 14:44:58.444 23687-23704/ru.biatech.fleettms I/WorkerWrapper: Worker result SUCCESS for Work [ id=387c91af-060c-473d-ab4e-c8d65172e48b, tags={ ru.biatech.fleettms.daemons.CacheWorker } ]
10-29 14:44:58.474 23687-24047/ru.biatech.fleettms D/CacheWorker: doWork() called
10-29 14:44:58.493 23687-23704/ru.biatech.fleettms I/WorkerWrapper: Worker result SUCCESS for Work [ id=e889913c-fbd8-468a-9ae8-4e13aba0f943, tags={ ru.biatech.fleettms.daemons.CacheWorker } ]
10-29 14:44:58.520 23687-24052/ru.biatech.fleettms D/CacheWorker: doWork() called
10-29 14:44:58.540 23687-23704/ru.biatech.fleettms I/WorkerWrapper: Worker result SUCCESS for Work [ id=f7d25122-67b2-4e91-b2bb-677614559c7f, tags={ ru.biatech.fleettms.daemons.CacheWorker } ]
10-29 14:44:58.588 23687-24051/ru.biatech.fleettms D/CacheWorker: doWork() called
10-29 14:44:58.607 23687-23704/ru.biatech.fleettms I/WorkerWrapper: Worker result SUCCESS for Work [ id=0052c751-22c5-4c42-830a-ba93334e48ce, tags={ ru.biatech.fleettms.daemons.CacheWorker } ]
10-29 14:44:58.638 23687-24047/ru.biatech.fleettms D/CacheWorker: doWork() called
10-29 14:44:58.657 23687-23704/ru.biatech.fleettms I/WorkerWrapper: Worker result SUCCESS for Work [ id=387c91af-060c-473d-ab4e-c8d65172e48b, tags={ ru.biatech.fleettms.daemons.CacheWorker } ]
10-29 14:44:58.692 23687-24052/ru.biatech.fleettms D/CacheWorker: doWork() called
10-29 14:44:58.716 23687-24051/ru.biatech.fleettms D/CacheWorker: doWork() called
10-29 14:44:58.717 23687-23704/ru.biatech.fleettms I/WorkerWrapper: Worker result SUCCESS for Work [ id=0a3c7f69-7bae-4e72-9e7b-cf9672ff2e17, tags={ ru.biatech.fleettms.daemons.CacheWorker } ]
10-29 14:44:58.725 23687-24047/ru.biatech.fleettms D/CacheWorker: doWork() called
10-29 14:44:58.741 23687-23704/ru.biatech.fleettms I/WorkerWrapper: Worker result SUCCESS for Work [ id=d8f9e4e5-5abc-47cf-a6bb-7e159ca415b9, tags={ ru.biatech.fleettms.daemons.CacheWorker } ]
10-29 14:44:58.749 23687-23704/ru.biatech.fleettms I/WorkerWrapper: Worker result SUCCESS for Work [ id=f7d25122-67b2-4e91-b2bb-677614559c7f, tags={ ru.biatech.fleettms.daemons.CacheWorker } ]
10-29 14:44:58.791 23687-24052/ru.biatech.fleettms D/CacheWorker: doWork() called
10-29 14:44:58.796 23687-24047/ru.biatech.fleettms D/CacheWorker: doWork() called
10-29 14:44:58.814 23687-23704/ru.biatech.fleettms I/WorkerWrapper: Worker result SUCCESS for Work [ id=86cc2efa-b0b0-4fa3-ac1f-ce884073e897, tags={ ru.biatech.fleettms.daemons.CacheWorker } ]
10-29 14:44:58.824 23687-23704/ru.biatech.fleettms I/WorkerWrapper: Worker result SUCCESS for Work [ id=dce3b734-cc37-4076-ba31-65eff7abcde9, tags={ ru.biatech.fleettms.daemons.CacheWorker } ]
10-29 14:44:58.865 23687-24051/ru.biatech.fleettms D/CacheWorker: doWork() called
10-29 14:44:58.884 23687-23704/ru.biatech.fleettms I/WorkerWrapper: Worker result SUCCESS for Work [ id=026979a5-12d0-420d-8328-7bab7c5ee624, tags={ ru.biatech.fleettms.daemons.CacheWorker } ]
10-29 14:44:58.915 23687-24047/ru.biatech.fleettms D/CacheWorker: doWork() called
10-29 14:44:58.933 23687-23704/ru.biatech.fleettms I/WorkerWrapper: Worker result SUCCESS for Work [ id=d8f9e4e5-5abc-47cf-a6bb-7e159ca415b9, tags={ ru.biatech.fleettms.daemons.CacheWorker } ]
10-29 14:44:58.946 23687-24052/ru.biatech.fleettms D/CacheWorker: doWork() called
10-29 14:44:58.956 23687-24051/ru.biatech.fleettms D/CacheWorker: doWork() called
10-29 14:44:58.975 23687-23704/ru.biatech.fleettms I/WorkerWrapper: Worker result SUCCESS for Work [ id=026979a5-12d0-420d-8328-7bab7c5ee624, tags={ ru.biatech.fleettms.daemons.CacheWorker } ]
10-29 14:44:58.996 23687-23704/ru.biatech.fleettms I/WorkerWrapper: Worker result SUCCESS for Work [ id=bb15463f-4812-422a-9d90-2a003c793e10, tags={ ru.biatech.fleettms.daemons.CacheWorker } ]
10-29 14:44:59.057 23687-24047/ru.biatech.fleettms D/CacheWorker: doWork() called
10-29 14:44:59.078 23687-23704/ru.biatech.fleettms I/WorkerWrapper: Worker result SUCCESS for Work [ id=cf9c8aea-e142-4e42-bb13-17dcb322d481, tags={ ru.biatech.fleettms.daemons.CacheWorker } ]
10-29 14:45:01.534 23687-24052/ru.biatech.fleettms D/CacheWorker: doWork() called
10-29 14:45:01.551 23687-23704/ru.biatech.fleettms I/WorkerWrapper: Worker result SUCCESS for Work [ id=333ee0c9-653f-4c82-8e41-32bc79120811, tags={ ru.biatech.fleettms.daemons.CacheWorker } ]
10-29 14:45:01.568 23687-24051/ru.biatech.fleettms D/CacheWorker: doWork() called
10-29 14:45:01.584 23687-23704/ru.biatech.fleettms I/WorkerWrapper: Worker result SUCCESS for Work [ id=333ee0c9-653f-4c82-8e41-32bc79120811, tags={ ru.biatech.fleettms.daemons.CacheWorker } ]

So, my question is - why worker called SO MANY times, and why so often?