Managing Cluster Elements Startup and
Shutdown
Use
Use this procedure to configure the cluster to work in the manner of a full parallelism, or to set its startup/shutdown to be serialized. For your configuration purposes, use the properties provided by the J2EE Engine Cluster Manager.
By default, the cluster elements start up and shut down in full parallelism mode, that is, simultaneously, without waiting for each other.
We recommend that you do not modify the default cluster elements startup and shutdown configuration unless there are synchronization problems within the cluster and you are officially advised by SAP support to maintain these settings.
Procedure
1.
Start the
J2EE Engine Visual
Administrator.
2. Choose Server/Dispatcher → Kernel → Cluster Manager → Properties tab.
3. Modify the required property values depending on the tasks you want to perform:
a. Use barrier.startup to determine the kind of the element's startup serialization.
There are three possible values: "none" – no serialization; "box" – serialization in the boundaries of the box, that is, the elements in one box will be started one by one; "cluster" – serialization in the boundaries of the whole cluster.
b. Use barrier.shutdown to determine the kind of the element's shutdown serialization – the use of this property is similar to the barrier.startup.
c. Use barrier.dependent to determine whether the startup and shutdown barriers are dependent.
This property has a Boolean value. If it is set to true, there can only be one starting or stopping element in the box/cluster at the moment. Otherwise, there can only be one starting and one stopping element.
d. Use barrier.timeout to specify the timeout, within which the element is forced to recheck its permissions to pass the barrier.
This property is used for optimization purposes. It is advisable not to change its value.
4.
Choose 
Save
Properties to save your changes.
Example
...
1. Example of a serialized startup/shutdown configuration:
barrier.startup=cluster
barrier.shutdown=cluster
barrier.dependent=true
barrier.timeout=10000
2. Example of a full parallelism configuration:
barrier.startup=none
barrier.shutdown=none
barrier.dependent=false
barrier.timeout=10000