27.4. Taking a Site Offline
In Red Hat JBoss Data Grid's Cross-datacenter replication configuration, if backing up to one site fails a certain number of times during a time interval, that site can be marked as offline automatically. This feature removes the need for manual intervention by an administrator to mark the site as offline.
It is possible to configure JBoss Data Grid to take down a site automatically when specified confiscations are met, or for an administrator to manually take down a site:
- Configure automatically taking a site offline:
- Declaratively in Remote Client-Server mode.
- Declaratively in Library mode.
- Using the programmatic method.
- Manually taking a site offline:
- Using JBoss Operations Network (JON).
- Using the JBoss Data Grid Command Line Interface (CLI).
27.4.1. Taking a Site Offline (Remote Client-Server Mode)
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In Red Hat JBoss Data Grid's Remote Client-Server mode, the
take-offline element is added to the backup element to configure when a site is automatically taken offline. An example of this configuration is as follows:
<backup>
<take-offline after-failures="${NUMBER}"
min-wait="${PERIOD}" />
</backup>
The
take-offline element use the following parameters to configure when to take a site offline:
- The
after-failuresparameter specifies the number of times attempts to contact a site can fail before the site is taken offline. - The
min-waitparameter specifies the number (in milliseconds) to wait to mark an unresponsive site as offline. The site is offline when themin-waitperiod elapses after the first attempt, and the number of failed attempts specified in theafter-failuresparameter occur.
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