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GRE Configuration Options

Settings in GRE

Description Valid values Default value Takes effect

Specifies the directory in which to keep the working copy of deployed rule packages. When a package is deployed, a copy of the deployed package is placed here. When the rules engine is restarted, all packages defined in this directory are loaded and made available for execution. Specifying a deployed-rules-directory is recommended. If a value is not assigned to the deployed-rules-directory option, the rule packages are placed in the WEB-INF\config sub-directory within the genesys-rules-engine web application directory. At this location the deployed rule packages may be deleted when an updated .war file is deployed.

If you choose to change the default value, ensure that the path exists and that the application server can write to the specified directory.

In release 8.5.2, for a clustered GRE created using the GRE-type application cluster template, where the cluster application object has the auto-synch-rules option (new in 8.5.2) set to false, the deployed rules files will continue to be stored in the deployed-rules-directory. In such cases a manual re-deployment will be required if deployment status is partial or if a new node joins the cluster.

Where such a cluster application object has the auto-synch-rules option set to true, deployed rules data will be stored in a shared cluster folder defined in option shared-root-directory (new in 8.5.2). Each clustered GRE node will have its own deployment folder in the cluster shared folder. The shared folder will help synchronize the clustered GREs after either connection disruptions or when a new GRE is added to the cluster.

If multiple GREs share the same host, the value of deployed-rules-directory must be unique for each GRE.


/GCTI/logs/GRS_Engine After restart

The maximum number of rules to be executed during a request. This is used to detect unwanted recursion when sequential-mode is false. If this maximum is reached an error is reported.

May be set to -1 to denote no maximum.

Any positive integer or -1

10,000 Next rules execution

Indicates whether to run the rules engine in sequential mode. In sequential mode, after the initial data set, no more data can be inserted or modified. This allows for the rules engine to operate in a simplified way.


false On rules deployment

Indicates whether to verify the TCP address of the application deploying rules to be that of a valid associated Genesys Rules Authoring Tool (one in the valid list of application connections). With its default value of true, this option protects against illegal attempts to deploy packages from any other application.


true Immediately

Specifies the maximum number of worker threads available when using the ESP interface to execute rules.

Any positive integer

5 Immediately

Indicates whether to load deployed rule packages at application start up. If packages are not loaded at startup (value=false), then a package is loaded on its first execution request.


true Immediately

With value true, the JsonHierarchicalStreamDriver class is used to serialize JSON responses. With value false, the JettisonMappedXmlDriver class is used. The Jettison driver is unaware of the original data type and will try to detect numerical values and omit the quotes, whereas the JsonHierarchicalStreamDriver will maintain the data type.


false Immediately
cache-operational-parameters (new in 8.5.0)

Operational parameters are rule parameters whose value is obtained at rule execution time. They are configured in GAX as Parameter Groups, and stored in the Configuration Server database. Prior to 8.5, whenever an operational parameter was referenced during the execution of a rule, GRE would fetch the current value from Configuration Server. In high-volume environments, this could put unnecessary stress on Configuration Server.

In GRS 8.5, the value of the operational parameters can be cached inside GRE, to make fetching faster. Instead of fetching the value with each reference, GRE will set up a listener to Configuration server and maintain the value in a local cache. When the administrator changes the value of the parameter using GAX, GRE will receive an event and update its local cache.

If cache-operational-parameters is set to true (default), this new caching mechanism will be enabled.

If cache-operational-parameters is set to false, no caching will be used and each reference will fetch the current value from Configuration Server (as was done prior to 8.5).


true Immediately
parameter-cache-timeout (new in 8.5.0)

When cache-operational-parameters is set to true, parameter-cache-timeout defines how long (in hours) an operational “parameter group” will remain in the cache. After the timeout expires, the transaction will be removed from the cache until the next time the value is requested. This is used to clean up old subscriptions to parameter groups which are no longer being referenced. The default value for this will be 168 (168 hours = 1 week).


168 Immediately
clear-cache-on-disconnect (new in 8.5.0)

When cache-operational-parameter is set to true, the clear-cache-on-disconnect parameter defines what the behavior should be if GRE loses connection with the Configuration Server. If clear-cache-on-disconnect is set to false, GRE will continue to use the cached value for any rule evaluations, until such time as the Configuration Server is restored. With this option, there is a risk that GRE could use “stale” values for rule evaluation during the time the connection to Configuration Server is down. If clear-cache-on-disconnect is set to true, the cache will be cleared and a null (“”) value will be used in the rules. With this option, there is potential that rules will fail evaluation during the period that the Configuration Server connection is down.


false Immediately
include-rule-evaluation-detail-in-response (new in 8.5.001)

Returns rules that did not fire, conditions that evaluated false and rule evaluation time back to the REST client invoking the rule evaluation request. Prior to 8.5.001, only the results of rules that fired were returned.

Note: Currently, the rulesDisqualified and executionTime is not returned via ESP to iWD.


false Immediately
unload-inactive-package-timeout (new in 8.5.1)

Specifies the interval (in minutes) after which, if a rule package remains unused by GRE, it is unloaded from memory. If the option is not specified, then packages are loaded in GRE with no timeout. If a request for a rule package is received after the package has been unloaded, it is automatically loaded into memory again and the timer is restarted.


No default At GRE start/restart
iwd-set-department-from-process (new in

Enables (value = true), GRE to determine the Department from the properties of its Process, for ESP server requests. The setting of the Department from the Process properties will only occur if the Department is not specified and the business context level 1 is not specified.


false At GRE start/restart
shared-root-directory (new in 8.5.200)

Specifies the shared root directory. When this option is used and option deployed-rules-directory-is-relative-to-shared-root is set to true, the effective deployed rules directory used by GRE is made by prepending this string to the path specified in deployed-rules-directory. It can be used to specify the path to the shared location used for the auto-synch feature for rules. Having this option empty (or not set) effectively allows setting an absolute path in the deployed-rules-directory even when deployed-rules-directory-is-relative-to-shared-root is set to true. It may be a value in Universal Naming Convention (UNC) format or mapped/mounted folder path backed by a service like Amazon S3 or simply an OS shared folder. Examples:

  • If shared-root-directory = C:\shared and deployed-rules-directory = \GRE1, then the effective deployed rules directory path used by GRE is C:\shared\GRE1 .
  • If shared-root-directory = \\\shared and deployed-rules-directory = \GRE1, then the effective deployed rules directory path used by GRE is \\\shared\GRE1 .
  • If the shared folder is mapped on drive Z, the shared-root-directory will be Z:, deployed-rules-directory may be \GRE1, then the effective deployed rules directory path used by GRE will be Z:\GRE1.

Universal Naming Convention (UNC) format is not supported where GRE runs on the AIX operating system.


After restart
deployed-rules-directory-is-relative-to-shared-root (new in 8.5.200)

Indicates whether to use the shared root directory as the root directory for deployed-rules-directory or not. It must be set to true if GRE belongs to a cluster that has auto-synch-rules or just auto-synch-rules-at-startup enabled. This may be used even when GRE does not belong to a cluster. If this option is set to false, auto-synch will not work.


false Immediately
enable-memory-monitor (implemented in HF

Enables or disables the Memory Monitor feature.

true/false: Absence of this property or invalid value results in false

false At GRE start/restart
memory-monitor-interval (implemented in HF

The interval in seconds between periodic memory usage checks.

integer: min 1

60 At GRE start/restart
memory-monitor-threshold (implemented in HF

The memory usage threshold expressed as a percentage. If memory usage goes above the threshold, GRE's status.jsp returns HTTP 503 status with a message SYSTEM_STATUS_MEMORY_USAGE_ABOVE_THRESHOLD. Genesys Management layer is also notified about GRE's unavailability via status set in LCA Connection. When memory usage is back below the threshold, GRE's status.jsp returns HTTP 200 status and Genesys Management Layer is notified that GRE is available.

integer: min 40, max 80

70 Immediately
memory-monitor-threshold-strategy (implemented in HF

Allows you to change the out of memory error handling behavior of memory monitor.

  • adaptive—At out-of-memory error, a new threshold is calculated and it is obtained by reducing the configured memory-monitor-adaptive-threshold-safety-margin amount from the percentage memory usage at the time Memory Monitor receives the out-of-memory notification. The threshold is reset only if the new calculated value is less than the configured threshold (or less than current override)—for example, if the configured threshold is 80 %, the safety margin is 10 % and if an out-of-memory error notification is retrieved when memory usage is 70 %, the new override threshold will be 70 - 10 = 60 %. In this scenario, Memory Monitor learned that out-of-memory error can happen at 70 % memory usage, so it adjusts the threshold to be 60 %.
The override threshold that the "adaptive" strategy sets can be removed by temporarily setting the strategy to "forced". It must be kept as "forced" for at least the memory-monitor-interval time. The override can also be removed by reducing the configured threshold value so that the new configured value is equal to, or lower than, the override threshold.
The override is removed if GRE is restarted, so it is recommended to change the configured threshold to match the override threshold before restarting the GRE.
  • forced—At out-of-memory error, it does nothing except logging the current memory usage. It forces Memory Monitor to raise an alarm only when memory usage is above the threshold. If using this approach, the threshold must be set low enough so that no out-of-memory errors occur. Temporarily setting this strategy allows the removal of the override threshold set by the "adaptive" strategy.


adaptive Immediately
memory-monitor-adaptive-threshold-safety-margin (implemented in HF

The safety margin percentage used by the "adaptive" strategy, when set. The new threshold, set when application memory is exhausted, is obtained by reducing this percentage amount from the percentage memory usage at the time of memory exhaustion.

integer: min 10, max 30

10 Immediately

Settings in the GRE Application Cluster

A new template for a GRE-specific application cluster—GRE_Rules_Engine_Application_Cluster_<version>.apd— is implemented in release 8.5.2. The configuration options below are set in the new application cluster, and allow you to configure how auto-synchronization works.

Description Valid values Default value Takes effect
auto-synch-rules (new in 8.5.200)

Set this to true to enable a GRE in cluster to start the periodic auto synch and auto deployment process. Clustered GRE's option deployed-rules-directory-is-relative-to-shared-root must be set to true to have them participate in rules auto synch process.

Option shared-root-directory can be used to specify the directory which is shared among all the clustered GREs. See option shared-root-directory for more information.

If this is true, whether auto-synch-rules-at-startup is set to true or false, the GRE always auto-synchronizes rules at startup.


false At GRE (re-)start
auto-synch-rules-interval (new in 8.5.200)

The interval in minutes between the end of the last synchronization check/auto deployment and the start of a new synchronization check.

Integer (minutes)

5 (minimum value = 1) At GRE (re-)start
auto-synch-rules-at-startup (new in 8.5.200)

Set this option to true to have the GREs synchronize and deploy rules at startup. This value is ignored if auto-synch-rules is set to true (that is, when auto-synch-rules is true then auto-synch is always performed at startup. This is useful if rules synchronization is required only at startup when auto-synch-rules is set to false.


false At GRE (re-)start
This page was last modified on July 17, 2015, at 08:53.


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