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Services, Directories, and Applications
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FIGURE 33-2
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The Request Manager tab, shown in Figure 33-3, allows you to enable or disable request flow control and enter values to set default request queue high- and low-water marks if appropriate. In addition, you must enter the minimum and maximum number of threads for the server. For low-volume servers, you can use the default values of 8 (minimum) and 64 (maximum) threads. However, high-volume sites will require some tuning of these parameters. For example, setting the minimum number of threads too low will reduce response time for new clients, since new threads must be spawned rather than drawn from the pool. In addition, if the maximum number of threads is set too low, then clients will be locked out! In general, you should perform load testing to determine an optimal threading configuration for the peak conditions experienced by your applications. A set of buttons at the bottom of the screen allows you to start, disable, or stop the server instance. If you make any configuration changes on the screen, you must either explicitly apply them by clicking the Apply Changes button or explicitly undo them by clicking the Undo Changes button. If you want to use the default values, click the Default Values button.
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The Sun Java System Application Server supports the Simple Network Management Protocol (SNMP), which enables you to have specific services monitored and, if an error is detected, to be notified through e-mail, phone, fax, pager, or cell phone that is, if you provide the appropriate SNMP monitoring software (note that the Sun Java System Application Server does not provide SNMP server functionality). The SNMP tab, shown in Figure 33-4, allows you to enable SNMP administration and monitoring, along with SNMP debugging features. In addition, you can set the connection attempt interval to a reasonably high figure, allowing reconnections to occur after a connection fault has been detected. In addition, a set of buttons at the bottom of the screen enables you to start, disable, or stop the server instance. If you make any configuration changes on the screen, you must either explicitly apply them by clicking the Apply Changes button or explicitly undo them by clicking the Undo Changes button. If you want to use the default values, click the Default Values button.
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Part VI:
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Services, Directories, and Applications
FIGURE 33-4
SNMP configuration
A key feature of the Sun Java System Application Server is its integration with the LDAP directory service. This allows users to be authenticated against a centralized service, and enables you to base access to resources on access control lists (ACLs) based on LDAP groups stored in the LDAP server. Since the Sun Java System Directory Server is bundled with the Sun Java System Application Server, it makes sense to use the integrated package for user management. The LDAP tab, shown in Figure 33-5, contains a list of all valid directory services that have been configured on the tab. The hostname, port number, user DN, and user path are all displayed, along with an optional group path. In addition, a set of buttons at the bottom of the screen allows you to add, modify, or remove LDAP services from the list. If you make any configuration changes on the screen, you must either explicitly apply them by clicking the Apply Changes button or explicitly undo them by clicking the Undo Changes button. If you want to use the default values, click the Default Values button.
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FIGURE 33-5
LDAP configuration
EJBs are the core programmable component technology used by the Sun Java System Application Server, as per the J2EE specification. A number of low-level parameters for EJB performance can be set from the EJB tab, as shown in Figure 33-6. These parameters include the default session timeout, the default object passivation timeout, the metadata cache size, the implementation cache size, the timer interval, and the failover save interval. Tuning these parameters will ensure that your application performs in line with its requirements. For example, if failover of persistent stateful session bean data is a high priority for an application, then you should set the failover safe interval to only a few seconds. This places a heavy toll on the server but improves data reliability. In contrast, if data loss is not critical to an application, then set the failover safe interval to a matter of minutes. This reduces the load on the server considerably but exposes your users to data-loss scenarios. In addition, a set of buttons at the bottom of the screen allows you to start, disable, or stop the server instance. If you make any configuration changes on the screen, you must either explicitly apply them by clicking the Apply Changes button or explicitly undo them by clicking the Undo Changes button. If you want to use the default values, click the Default Values button.
Part VI:
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