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Intelligent Management: on demand router system and custom properties

You can use on demand router (ODR) custom properties to change the behavior of your ODR. For example, you can change the error code that the ODR returns when messages are rejected because of processor or memory overload.

Cell Custom properties

To set a cell custom property on the ODR in the administrative console, click on System administration > Cell > Custom Properties.

CenterCell custom property
When you are configuring multi-cell performance management in your environment, you can use the CenterCell custom property to designate one cell as the center cell. You also set the CenterCell custom property individually for each cell that you want to designate as a point cell.
Avoid trouble: One and only one custom property should be set to true.
Table 1. CenterCell custom property values
Value Description
Scope Cell
Valid values true: Designates one cell as the center cell

false: Designates one cell as a point cell
ODR.heapUsage.algorithm
Use the ODR.heapUsage.algorithm custom property to configure when heap usage is calculated. If you set the value to globalGC, the amount of heap usage is calculated only immediately after a global garbage collection cycle. If you set the value to request, the amount of heap usage is calculated with each request.
Table 2. ODR.heapUsage.algorithm custom property
Value Description
Scope Cell
Value Algorithm
Default globalGC
ODR.heapUsage.errorCode
Use the ODR.heapUsage.errorCode custom property to configure the type of error code that is returned when a request is received and the heap usage exceeds the maximum threshold.
Table 3. ODR.heapUsage.errorCode custom property
Value Description
Scope Cell
Value Integer
Default 503
ODR.heapUsage.max
Use the ODR.heapUsage.max custom property to configure a percentage value that determines at what amount of heap usage the ODR rejects requests. If heap usage exceeds 90%, the ODR rejects any incoming request and a 503 error code is returned.
Table 4. ODR.heapUsage.max custom property
Value Description
Scope Cell
Value Percentage
Default 90%
ODR.sslAlias.<cluster_name>
Use the ODR.sslAlias.<cluster_name> custom property to specify the SSL alias name to be used during SSL outbound connections to any of the servers in the specified cluster. Set this custom property at cell level. Restart the ODR in order for this custom property setting to take effect.
Table 5. ODR.sslAlias custom property
Value Description
Scope Cell
Value Cluster name

HTTP and SIP custom properties

To set HTTP and SIP custom properties on the ODR in the administrative console, click on Servers > On demand routers > ${ODR} > Java and Process Management > Process definition > Java Virtual Machine > Custom Properties.

http.partialResponseBodyBufferSize
Use the http.partialResponseBodyBufferSize custom property to disable the ODR from buffering the size of the response payload when you perform a rollout on an application edition. Set the http.partialResponseBodyBufferSize custom property to a value of 0.
Table 6. http.partialResponseBodyBufferSize custom property
Value Description
Scope On demand router
Value Integer
Default 0
http.overload.error
Use the http.overload.error custom property to configure a custom error code for the autonomic request flow manager to return when an HTTP message over TCP or SSL is rejected due to processor or memory overload. If you do not configure this custom property, the default 503 error code is returned.
Table 7. http.overload.error custom property
Value Description
Scope On demand router
Value Integer
Default 503
sip.overload.error
Use the sip.overload.error custom property to configure a custom error code for the autonomic request flow manager to return when a Session Initiation Protocol (SIP) message over Transmission Control Protocol (TCP) or Secure Sockets Layer (SSL) is rejected because of processor or memory overload. If you do not configure this custom property, the default 503 error code is returned.
Table 8. sip.overload.error custom property
Value Description
Scope On demand router
Value Integer
Default 503
sipu.overload.error
Use the sipu.overload.error custom property to configure a custom error code for the autonomic request flow manager to return when a Session Initiation Protocol (SIP) message over User Datagram Protocol (UDP) is rejected due to processor or memory overload. If you do not configure this custom property, the default 503 error code is returned.
Table 9. sipu.overload.error custom property
Value Description
Scope On demand router
Value Integer
Default 503

Logging custom properties

You can use on demand router (ODR) custom properties to change the http logging behavior of your ODR. To set any of the following logging custom properties on the ODR in the administrative console, click on Servers > Server Types > On Demand Routers > ${ODR} > On Demand Router Properties > On Demand Router settings > Custom Properties.

http.log.history custom property
Use the http.log.history custom property to specify the number of history server log files. The server log files are the ODR custom log files, as well as the proxy.log, local.log, and cache.log files. Without this custom property, you have one history file for the server log files. Setting this custom property does not affect the custom logs that are already initialized.
Table 10. http.log.history custom property values
Value Description
Scope ODR or ODR cluster
Value Any positive integer greater than 0
Default 1
http.log.history.backup.list custom property
By default, existing custom log files from previous runs are not counted towards the maximum number of history files. Set the http.log.history.backup.list proxy custom property to true so that the ODR counts existing custom logs towards the maximum number of history files.
Table 11. http.log.history.backup.list custom property values
Value Description
Scope ODR or ODR Cluster
Value Any positive integer greater than 0
Default 1
http.log.maxSize custom property
Use the http.log.maxSize custom property to specify the maximum log size in megabytes (MB). A value of UNLIMITED indicates unlimited. As with the http.log.history custom property, the http.log.maxSize custom property applies to the ODR custom log files, as well as the proxy.log, local.log, and cache.log files.
Table 12. http.log.maxSize custom property values
Value Description
Scope ODR or ODR cluster
Value Any positive integer greater than 0
Default 500 MB

On Demand Router properties

To set any of the following On Demand Router properties on the ODR in the administrative console, click on Servers > On demand routers > ${ODR}on_demand_router > Java and Process Management > Process definition > Java Virtual Machine > Custom Properties.

ODR.traceRouteHeader
Use the ODR.traceRouteHeader system property on the ODR, and it will add a response header with the route that the request took.

For example, -DODR.traceRouteHeader=TraceRoute adds a response header with the name TraceRoute to each request. The value of this response header is the path that the request took.

ODCLeftGroupDelay

The ODCLeftGroupDelay is specified in milliseconds. Set the value to no less than 30000 milliseconds to allow enough time to handle any processes that become peer-to-peer (P2P) unresponsive. Setting ODCLeftGroupDelay=0 avoids any delay for on-demand configuration detection of down servers during failover when servers become unavailable.

When setting the ODCLeftGroupDelay, temporary network issues can starve resources and ODC recovery processing can add stress to the network.

Avoid trouble: ODCLeftGroupDelay needs to be set on the deployment manager, all node agents, and, if present, all Java ODRs. This property is not dynamic and your settings will not take effect until the system in synchronized and the process has been restarted.