Module org.elasticsearch.server

Package org.elasticsearch.cluster.coordination

Class StableMasterHealthIndicatorService

java.lang.Object

org.elasticsearch.cluster.coordination.StableMasterHealthIndicatorService

All Implemented Interfaces:

HealthIndicatorService

public class StableMasterHealthIndicatorService
extends Object
implements HealthIndicatorService

This indicator reports the health of master stability. If we have had a master within the last 30 seconds, and that master has not changed more than 3 times in the last 30 minutes, then this will report GREEN. If we have had a master within the last 30 seconds, but that master has changed more than 3 times in the last 30 minutes (and that is confirmed by checking with the last-known master), then this will report YELLOW. If we have not had a master within the last 30 seconds, then this will will report RED with one exception. That exception is when: (1) no node is elected master, (2) this node is not master eligible, (3) some node is master eligible, (4) we ask a master-eligible node to run this indicator, and (5) it comes back with a result that is not RED. Since this indicator needs to be able to run when there is no master at all, it does not depend on the dedicated health node (which requires the existence of a master).

Field Summary

Fields

Modifier and Type	Field	Description
static final String	AUTOMATION_DISABLED_IMPACT_ID
static final String	BACKUP_DISABLED_IMPACT_ID
static final Diagnosis	CONTACT_SUPPORT
static final String	INGEST_DISABLED_IMPACT_ID
static final String	NAME
static final Diagnosis	TROUBLESHOOT_DISCOVERY
static final Diagnosis	TROUBLESHOOT_UNSTABLE_CLUSTER

Fields inherited from interface org.elasticsearch.health.HealthIndicatorService

MAX_AFFECTED_RESOURCES_COUNT

Constructor Summary

Constructors

Constructor	Description
StableMasterHealthIndicatorService(CoordinationDiagnosticsService coordinationDiagnosticsService, ClusterService clusterService)

Method Summary

Modifier and Type	Method	Description
HealthIndicatorResult	calculate(boolean verbose, int maxAffectedResourcesCount, HealthInfo healthInfo)
boolean	isPreflight()	A preflight indicator is an indicator that is run first and represents a serious cascading health problem.
String	name()

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.elasticsearch.health.HealthIndicatorService

calculate, createIndicator

Field Details

NAME

public static final String NAME

See Also:

• Constant Field Values

TROUBLESHOOT_DISCOVERY

public static final Diagnosis TROUBLESHOOT_DISCOVERY

TROUBLESHOOT_UNSTABLE_CLUSTER

public static final Diagnosis TROUBLESHOOT_UNSTABLE_CLUSTER

CONTACT_SUPPORT

public static final Diagnosis CONTACT_SUPPORT

INGEST_DISABLED_IMPACT_ID

public static final String INGEST_DISABLED_IMPACT_ID

See Also:

• Constant Field Values

AUTOMATION_DISABLED_IMPACT_ID

public static final String AUTOMATION_DISABLED_IMPACT_ID

See Also:

• Constant Field Values

BACKUP_DISABLED_IMPACT_ID

public static final String BACKUP_DISABLED_IMPACT_ID

See Also:

• Constant Field Values

Constructor Details

StableMasterHealthIndicatorService

public StableMasterHealthIndicatorService(CoordinationDiagnosticsService coordinationDiagnosticsService,
 ClusterService clusterService)

Method Details

name

public String name()

Specified by:

name in interface HealthIndicatorService

isPreflight

public boolean isPreflight()

Description copied from interface: HealthIndicatorService

A preflight indicator is an indicator that is run first and represents a serious cascading health problem. For example, the `stable_master` health indicator is a preflight indicator. When it is red it means that the node has witnessed too many master nodes which could mean there are missing nodes, or a discovery problem, or that the node itself has problems joining the elected master. For these reasons, it likely that the cluster state is not up-to-date enough for us to make health decisions off of it.

Specified by:

isPreflight in interface HealthIndicatorService

Returns:

true if this is a preflight indicator, false otherwise.

calculate

public HealthIndicatorResult calculate(boolean verbose,
 int maxAffectedResourcesCount,
 HealthInfo healthInfo)

Specified by:

calculate in interface HealthIndicatorService