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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:
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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.
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Provides the ability to send and receive messages between cluster members.
The Group Management Service page contains the following options.
- Load Defaults
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Button to restore settings that have default values to their default values. Settings that do not have default values are not changed.
- Configuration Name
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The name of the configuration to which the settings on this page apply. This field is read only.
- Maximum Missed Heartbeats
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The number of missed heartbeats from a member after which a server instance failure is suspected. The default is 3.
- Heartbeat Frequency
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The period of time between missed heartbeats from a member. The default is 2000 milliseconds.
- Group Discovery Timeout
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The amount of time that the GMS waits for discovery of other cluster members. The default is 5000 milliseconds.
- Failure Verification Wait Time
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The amount of time to wait before verifying that a member that is suspected to have failed should be reported as failed. The default is 1500 milliseconds.
- Additional Properties
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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
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The name of the property.
- Value
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The value that of the property that is set for the selected instance.
- Description
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A textual description that provides more information about the property.
The Additional Properties table also contains the following options.
- Add Property
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Button to add a property. Clicking this button adds a row to the Additional Properties table.
- Delete Properties
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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.
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