Class JvmMemoryPressureCheck

java.lang.Object

com.kingsrook.qqq.backend.core.health.JvmMemoryPressureCheck

All Implemented Interfaces:

HealthCheck

public class JvmMemoryPressureCheck
extends Object
implements HealthCheck

Readiness and liveness views of JvmMemoryPressure. READINESS: DEGRADED as soon as pressure starts; after readinessAfterSeconds it is DOWN (503 on /ready, the pod leaves the Service) when the host opted in with QQQ_HEALTH_MEMORY_READINESS_ACTION=down, else it stays DEGRADED. LIVENESS: DOWN once pressure has lasted livenessAfterSeconds, which fails /live and lets the orchestrator restart the JVM instead of letting it crawl until OutOfMemoryError.

Field Summary

Fields

Modifier and Type	Field	Description
static final String	LIVENESS_NAME
static final String	READINESS_NAME

Constructor Summary

Constructors

Constructor	Description
JvmMemoryPressureCheck(HealthCheckKind kind)	Check against the JVM-wide monitor.
JvmMemoryPressureCheck(HealthCheckKind kind, Supplier<JvmMemoryPressure> monitor)	Check against a given monitor (tests).

Method Summary

Modifier and Type	Method	Description
static List<HealthCheckMetaData>	definitions()	Core registrations: a readiness check and a liveness-probe check, both evaluated live on every probe (never from the runner's cache).
HealthCheckOutcome	run(HealthCheckInput input)	Sample and judge.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

READINESS_NAME

public static final String READINESS_NAME

See Also:

• Constant Field Values

LIVENESS_NAME

public static final String LIVENESS_NAME

See Also:

• Constant Field Values

Constructor Details

JvmMemoryPressureCheck

public JvmMemoryPressureCheck(HealthCheckKind kind)

Check against the JVM-wide monitor.

JvmMemoryPressureCheck

public JvmMemoryPressureCheck(HealthCheckKind kind,
 Supplier<JvmMemoryPressure> monitor)

Check against a given monitor (tests).

Method Details

definitions

public static List<HealthCheckMetaData> definitions()

Core registrations: a readiness check and a liveness-probe check, both evaluated live on every probe (never from the runner's cache).

run

public HealthCheckOutcome run(HealthCheckInput input)

Sample and judge.

Specified by:

run in interface HealthCheck