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Edit Group Management Service 
Use the Group Management Service page to change GMS settings.

The Group Management Service (GMS) is an in-process service that provides cluster monitoring,
cluster membership, and group communication services. The GMS is built atop a configurable
stack of group membership discovery and health monitoring protocols. The GMS performs the
following functions:


Notifies registered modules in a GlassFish Server instance when one or more member instances are added to or removed from a cluster, or are suspected or confirmed to have failed.


Provides the ability to send and receive messages between a group of processes.


The Group Management Service page contains the following options.

Load Defaults
Button to restore settings that have default values to their default values. Settings that do not have default values are not changed.


Configuration Name
The name of the configuration to which the settings on this page apply. This field is read only.


Maximum Missed Heartbeats
The number of monitoring attempts after which a server instance failure is suspected. The default is 3.


Heartbeat Frequency
The period of time between monitoring attempts. The default is 2000 milliseconds.


Group Discovery Timeout
The amount of time that the GMS waits for discovery of other cluster members. The default is 5000 milliseconds.


Failure Verification Wait Time
The amount of time after which a suspected failure is marked as verified. The default is 1500 milliseconds.


Additional Properties
A table of additional properties for the Group Management Service.

GlassFish Server does not define any additional GMS properties.

For each property, the following information is displayed:

Name
The name of the property.


Value
The value that of the property that is set for the selected instance.


Description
A textual description that provides more information about the property.



The Additional Properties table also contains the following options.

Add Property
Button to add a property. Clicking this button adds a row to the Additional Properties table.


Delete Properties
Button to delete one or more selected properties. Any property that is deleted reverts to its default value or, if no default value is set, is undefined.





Related Tasks

To Enable the Group Management Service


To Configure the Group Management Service


To Configure Group Management Service Settings for a Cluster




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