Sync Modes

Set Sync Command

The Fabric Set Sync command is used to define the synchronization mode of an instance from source systems. The default value is ON.

SYNTAX: SET SYNC [SYNC MODE];

Sync Modes

Note that the sync returns an error message when a source is not available. To change this behavior, use the set ignore_source_exception true command.

Sync ON Protection

Sync ON protection improves the response time of multiple GET LUI requests on the same LUI and Fabric node. For example, executing a stress test by running a Web Service with the same LUI on multiple threads. In principle, since each request requires a write lock in the LUI's MicroDB, multiple requests on the same LUI and Fabric node are executed sequentially if they all implement Sync ON mode. This means that even when LUI populations are not run, a short check can take a long time before the last GET is successful.

To avoid checking each LUI, Fabric implements Sync ON mode only on the first GET request on the LUI. Remaining requests are executed in parallel to the first request when executed in Sync OFF mode.

SYNC_PROTECTION can be edited in the config.ini file:

1. The default value is zero. Fabric implements Sync ON mode only on the first request.
2. If this parameter is set to -1, Sync ON protection is disabled and Fabric implements Sync ON mode on each request.
3. This parameter can be set in milliseconds. For example, if set to 1000, all Sync requests executed on the same LUI and Fabric node during the 1000ms after the first request, run in Sync OFF mode. After 1000ms, and until the first GET request on the LUI is completed, Fabric sets the Sync mode to ON.

Since release 6.2.3, SYNC_PROTECTION can be disabled on the session level by using SET SYNC_PROTECTION=off command.

Fabric Studio Server Configuration - Force Upgrade Post Deploy Checkbox

The Force Upgrade Post Deploy checkbox is defined for each predefined Fabric server in the Server Configuration window:

This checkbox defines the Sync mode of the first GET of each LU instance (LUI) after the LU is deployed to the server:

• If checked, the Sync mode is set to FORCE.
• When unchecked, the Sync mode is set to ON.

Notes

• Checking / unchecking the Force Upgrade Post Deploy checkbox impacts the LU only after redeployment of the LU to the checked / unchecked Fabric server. It does not impact the LU instances retroactively.
• Sync mode is set to FORCE only for the first GET of each LUI after the redeployment of the LU.
• Sync mode is set to FORCE for the first GET of each LUI even if the Force Upgrade Post Deploy checkbox is later unchecked. The LU is redeployed, and the instance is not synchronized while the Force Upgrade Post Deploy checkbox is still checked.

Example 1

• Set the Sync Method of the Customer LU to None.
• Get Customer 1.
• Update the source DB of Customer 1.
• Check the Force Upgrade Post Deploy checkbox of the Fabric development server and redeploy the Customer LU to this server.
• Get Customer 1 again. The customer is synchronized and their data is updated since the Force Upgrade Post Deploy checkbox set the sync mode to FORCE.
• Update the source data of Customer 1 again.
• Get Customer 1 again. This time Customer 1 is not synchronized since the Sync mode is set back to ON for the Customer after their first sync that was initiated by checking the Force Upgrade Post Deploy checkbox.

Example 2

• Set the Sync Method of the Customer LU to None.
• Get Customers 1 and 2.
• Update the source DB of Customers 1 and 2.
• Check the Force Upgrade Post Deploy checkbox of Fabric the development server and redeploy the Customer LU to this server.
• Get Customer 2 again. This Customer is synchronized and their data is updated.
• Uncheck the Force Upgrade Post Deploy checkbox of the Fabric development server and redeploy the Customer LU to this server.
• Get Customers 1 and 2 again:
  • Customer 1 is synchronized since this is their first GET after checking the Force Upgrade Post Deploy checkbox, even though this checkbox was later unchecked.
  • Customer 2 is not synchronized since it was already synchronized after checking the Force Upgrade Post Deploy checkbox.

Click for more information about the Get LUI Fabric Command.

Get Sync Mode

The Fabric UserCode class holds the method that returns the Sync mode set for the current session:

public static String getSyncMode();

This method can be invoked by a Decision function. For example: If the Sync Mode is FORCE, then return True to sync the instance. Else, do not sync the instance.

To view the list of Fabric APIs, click http://[Fabric IP address]:3213/static/doc/user-api/index.html.

Always Sync

• The Always Sync mode enables synchronizing the attached LUI when running select queries on the LUI. The sync of the LUI is executed before the execution of the select queries.
• To define an Always Sync mode either:
  • Set the ALWAYS_SYNC parameter of the config.ini file to True. The default value is False.
  • Run the SET ALWAYS_SYNC=TRUE Fabric command to override the Always Sync mode and set it to true on the session level.