Configuring the Load Balancer | Sun Microsystems 820434310 manual

Configuring the Load Balancer

For optimal performance, use a pool with eight to 16 connections per node. For example, if you have four nodes configured, then the steady-pool size must be set to 32 and the maximum pool size must be 64. Adjust the Idle Timeout and Pool Resize Quantity values based on monitoring statistics.

For the best performance, use the following settings:

■Connection Validation: Required

■Validation Method: metadata

■Transaction Isolation Level: repeatable-read

In addition to the standard attributes, add the two following properties:

■cacheDatabaseMetaData: false

■eliminateRedundantEndTransaction: true

To add a property, click the Add Property button, then specify the property name and value, and click Save.

For more information on configuring the JDBC connection pool, see “Tuning JDBC

Connection Pools” on page 77.

Configuring the Load Balancer

The Enterprise Server provides a load balancer plugin that can balance the load of requests among multiple instances which are part of the cluster.

Note – The following section assumes that the server is tuned effectively to service incoming requests.

Enabling the Health Checker

The load balancer periodically checks all the configured Enterprise Server instances that are marked as unhealthy, based on the values specified in the health-checker element in the loadbalancer.xml file. Enabling the health checker is optional. If the health checker is not enabled, periodic health check of unhealthy instances is not performed.

The load balancer’s health check mechanism communicates with the application server instance using HTTP. The health checker sends an HTTP request to the URL specified and waits for a response. The status code in the HTTP response header should be between 100 and 500 to consider the instance to be healthy.

To enable the health checker, edit the following properties:

■url: Specifies the listener’s URL that the load balancer checks to determine its state of health.

120	Sun GlassFish Enterprise Server 2.1 Performance Tuning Guide • January 2009

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Sun Microsystems 820434310 manual Configuring the Load Balancer, Enabling the Health Checker

Contents

Sun GlassFish Enterprise Server 2.1 Performance Tuning Guide Sun Microsystems, Inc Network Circle Santa Clara, CA 090304@21990 Contents Tuning the Enterprise Server 100 Tuning for High-Availability Figures Page Tables Page Examples Page Sun GlassFish Enterprise Server Documentation Set Table P-1Books in the Enterprise Server Documentation Set Default Paths and File Names Table P-2Default Paths and File Names Symbol Conventions Symbol ConventionsTypographic Conventions Table P-3Typographic Conventions Documentation, Support, and Training Third-Party Web Site ReferencesSun Welcomes Your Comments 1Performance Tuning Roadmap Process Overview Performance Tuning Sequence Performance Tuning Roadmap Understanding Operational Requirements Application Architecture Client-Side Presentation User Authentication and Authorization Security RequirementsEncryption Hardware Resources General Tuning Concepts Administration Capacity Planning 2Factors That Affect Performance User Expectations To Determine Capacity Further Information Java Programming Guidelines Avoid Serialization and DeserializationUse StringBuffer to Concatenate Strings String str = testing str = str + abc Assign null to Variables That Are No Longer NeededDeclare Methods as final Only If Necessary Declare Constants as static final Java Server Page and Servlet Tuning Synchronize Only When NecessaryDeclare Method Arguments final Use DataHandlers for Soap Attachments Suggested Coding Practices General GuidelinesAvoid Shared Modified Class Variables Http Session Handling Configuration and Deployment Tips Disable Security ManagerOptimize SSL EJB Performance Tuning GoalsMonitoring EJB Components Following is a sample of the monitoring output Asadmin get -m monitorableObject Monitoring Individual EJB Components General Guidelines Use High Performance BeansUse Caching Using Local and Remote Interfaces Cache and Pool Tuning TipsUse the Appropriate Stubs Remove Unneeded Stateful Session Beans Using Pass-By-Reference Semantics Prefer Local Interfaces Improving Performance of EJB Transactions Using Special Techniques Configure Jdbc Resources as One-Phase Commit ResourcesUse the Least Expensive Transaction Attribute Version Consistency Entity-mapping cmp-field-mapping To enable request partitioning When new.VCVERSIONNUMBER = old.VCVERSIONNUMBER DeclareRequest Partitioning Cmp-field-mapping consistency Tuning Tips for Specific Types of EJB Components Entity BeansStateful Session Beans Checkpoint only when needed Stateless Session BeansRead-Only Entity Beans Pre-fetching Container Managed Relationship CMR Beans Refresh period OrderTable.OrderID = OrderLineTable.OrderLineOrderID Jdbc and Database Access Use Jdbc DirectlyEncapsulate Business Logic in Entity EJB Components Close Connections Tuning Message-Driven Beans Asadmin set server.mdb-container.max-pool-size = valueUse getConnection Tune the Message-Driven Bean’s Pool Size Cache Bean-Specific Resources Limit Use of JMS Connections Tuning the Enterprise Server Deployment Settings Logger Settings Disable Auto-deploymentDisable Dynamic Application Reloading Use Pre-compiled JavaServer Pages Web Container Settings General SettingsSession Properties Session Timeout Log Levels Disable Dynamic JSP Reloading Manager Properties Reap Interval EJB Container Settings Tuning the EJB ContainerMonitoring the EJB Container Overview of EJB Pooling and Caching Tuning the EJB Pool EJB Pool Settings Tuning the EJB Cache EJB Cache Settings Pool and Cache Settings for Individual EJB Components Commit Option Determining the best commit option Java Message Service Settings Transaction Service SettingsMonitoring the Transaction Service Viewing Monitoring Information Tuning the Transaction Service Disable Distributed Transaction LoggingAsadmin get -m serverInstance.transaction-service Http Service Settings Monitoring the Http ServiceRecover On Restart Automatic Recovery Keypoint Interval Enabled List --user admin --portProperty name=statsProfilingEnabled value=false DNS Cache Information dns HitRatio Caching DNS EntriesLimit DNS Lookups to Asynchronous NameLookups File Cache Information file-cache Keep Alive keep-alive Tuning the Http Service Access LogConnection Queue Request Processing Request Timeout Thread CountInitial Thread Count Keep Alive Buffer LengthMax Connections DNS Lookup Enabled Http ProtocolHttp File Cache Time Out Max Files Count Hash Init SizeMax Age Small/Medium File Size and File Size Limit Tuning Http Listener Settings Network AddressAcceptor Threads ORB Settings OverviewHow a Client Connects to the ORB Monitoring the ORB Tuning the ORB 3Tunable ORB SettingsConnection Statistics Thread Pools Tunable ORB Parameters ORB Thread Pool Parameters Using multiple connections Client ORB PropertiesControlling connections between client and server ORB Thread Pool Sizing Examining Iiop MessagesLoad Balancing Improving ORB Performance with Java Serialization Thread Pool Settings Tuning Thread Pools Unix /Linux onlyTo Enable Java Serialization Using JSG for Application Clients Jdbc Connection Pool Settings Tuning Jdbc Connection PoolsResources Monitoring Jdbc Connection Pools Pool Size Settings Timeout Settings4Connection Pool Sizing Isolation Level Settings Connection Validation Settings Connector Connection Pool Settings Transaction Support Testpool Page Tuning the Java Runtime System Java Virtual Machine Settings Tuning the Garbage Collector Managing Memory and Garbage Collection Choosing the Garbage Collection Algorithm To use the CMS collectorAdditional Information Other Garbage Collector Settings Tracing Garbage Collection Tuning the Java Heap Guidelines for Java Heap Sizing1Maximum Address Space Per Process Heap Tuning Parameters Xmsvalue Xmxvalue Example 4-1Heap Configuration on Solaris Rebasing DLLs on WindowsSurvivor Ratio Sizing Enter this command rebase -b 0x6000000 *.dll To rebase the Application Server’s DLLs For more information on tuning the JVM, see Page Server Scaling Processors Memory Disk SpaceNetworking Tuning Parameters Sizing the Connection Hash Table Ndd -get /dev/tcp tcpconnhashNetstat -nP tcpwc -l Linux Configuration File Descriptor Setting Tuning for Solaris on File Descriptors on IP Stack Settings on IP Stack Settings File Descriptors Tuning for Linux platforms Virtual Memory Soft Nofile 65535 HardSession required /lib/security/pamlimits.so Disk I/O Settings TCP/IP SettingsTo tune the TCP/IP settings Network Interface Tuning UltraSPARC T1-Based Systems Tuning Operating System and TCP Settings 2Tuning 64-bit Systems for Performance Benchmarking Disk Configuration Network ConfigurationStart Options 106 Tuning Hadb Disk UseCalculating Hadb Data Device Size Tuning Data Device Size Hadbm set TotalDatadeviceSizePerNode Memory Allocation Placing Hadb files on Physical DisksBeware last flush/fputs took too long Vmstat -S Performance DataBufferPoolSizeNodeNo TotalSize FreeSize Usage 512 504 Tuning DataBufferPoolSize LogBufferSizeHadbm set DataBufferPoolSize Tuning LogBufferSize InternalLogbufferSizeHadbm resourceinfo --logbuf Node No Avail Free Size Tuning InternalLogbufferSize NumberOfLocksHadbm resourceinfo --nilogbuf Hadbm set InternalLogbufferSize Tuning NumberOfLocks Calculating the number of locksSummary Timeouts Jdbc connection pool timeoutsLoad Balancer timeouts Node No Avail Free Waits 50000 Tuning the Enterprise Server for High-Availability Operating System ConfigurationHadb timeouts No space left on device Tuning Session Persistence Frequency Web-methodTime-based Session Persistence Scope Session SizeSession Modified-session Configuring the Jdbc Connection Pool Checkpointing Stateful Session Beans Configuring the Load Balancer Enabling the Health Checker Tuning for High-Availability 121 122 Index Index 125 Monitoring transaction service Session timeout 128