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[SPARK-46664][CORE] Improve Master to recover quickly in case of zero workers and apps #44673

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[SPARK-46664][CORE] Improve Master to recover quickly in case of zero workers and apps #44673

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[SPARK-46664][CORE] Improve `Master` to recover quickly in case of ze…
dongjoon-hyun Jan 10, 2024
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dongjoon-hyun Jan 10, 2024
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3 changes: 3 additions & 0 deletions core/src/main/scala/org/apache/spark/deploy/master/Master.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -619,6 +619,9 @@ private[deploy] class Master(
case e: Exception => logInfo("Worker " + worker.id + " had exception on reconnect")
}
}

// In case of zero workers and apps, we can complete recovery.
if (canCompleteRecovery) { completeRecovery() }
}

private def completeRecovery(): Unit = {
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24 changes: 24 additions & 0 deletions core/src/test/scala/org/apache/spark/deploy/master/MasterSuite.scala
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Expand Up @@ -250,6 +250,30 @@ class MasterSuite extends SparkFunSuite
CustomRecoveryModeFactory.instantiationAttempts should be > instantiationAttempts
}

test("SPARK-46664: master should recover quickly in case of zero workers and apps") {
val conf = new SparkConf(loadDefaults = false)
conf.set(RECOVERY_MODE, "CUSTOM")
conf.set(RECOVERY_MODE_FACTORY, classOf[FakeRecoveryModeFactory].getCanonicalName)
conf.set(MASTER_REST_SERVER_ENABLED, false)

var master: Master = null
try {
master = makeMaster(conf)
master.rpcEnv.setupEndpoint(Master.ENDPOINT_NAME, master)
eventually(timeout(2.seconds), interval(100.milliseconds)) {
getState(master) should be(RecoveryState.ALIVE)
}
master.workers.size should be(0)
} finally {
if (master != null) {
master.rpcEnv.shutdown()
master.rpcEnv.awaitTermination()
master = null
FakeRecoveryModeFactory.persistentData.clear()
}
}
}

test("master correctly recover the application") {
val conf = new SparkConf(loadDefaults = false)
conf.set(RECOVERY_MODE, "CUSTOM")
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