Checkpointing Stateful Session Beans | Sun Microsystems 820434310

Tuning the Enterprise Server for High-Availability

It is important to pay attention while determining the HTTP session size. If you are creating large HTTP session objects, calculate the HADB nodes as discussed in “Tuning HADB” on page 107.

Checkpointing Stateful Session Beans

Checkpointing saves a stateful session bean (SFSB) state to the HADB so that if the server instance fails, the SFSB is failed over to another instance in the cluster and the bean state recovered. The size of the data being checkpointed and the frequency at which checkpointing happens determine the additional overhead in response time for a given client interaction.

You can enable SFSB checkpointing at numerous different levels:

■For the entire server instance or EJB container

■For the entire application

■For a specific EJB module

■Per method in an individual EJB module

For best performance, specify checkpointing only for methods that alter the bean state significantly, by adding the <checkpointed-methods> tag in the sun-ejb-jar.xml file.

Configuring the JDBC Connection Pool

The Enterprise Server uses JDBC to store and retrieve HADB data. For best performance, configure the JDBC connection pool for the fastest possible HADB read/write operations.

Configure the JDBC connection pool in the Admin Console under Resources > JDBC > Connection Pools > pool-name. The connection pool configuration settings are:

■Initial and Minimum Pool Size: Minimum and initial number of connections maintained in the pool (default is 8)

■Maximum Pool Size: Maximum number of connections that can be created to satisfy client requests (default is 32)

■Pool Resize Quantity: Number of connections to be removed when idle timeout timer expires

■Idle Timeout: Maximum time (seconds) that a connection can remain idle in the pool. (default is 300)

■Max Wait Time: Amount of time (milliseconds) caller waits before connection timeout is sent

Chapter 6 • Tuning for High-Availability

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Sun Microsystems 820434310 manual Checkpointing Stateful Session Beans, Configuring the Jdbc Connection Pool

Contents

Sun Microsystems, Inc Network Circle Santa Clara, CA Sun GlassFish Enterprise Server 2.1 Performance Tuning Guide 090304@21990 Contents Tuning the Enterprise Server 100 Tuning for High-Availability Figures Page Tables Page Examples Page Table P-1Books in the Enterprise Server Documentation Set Sun GlassFish Enterprise Server Documentation Set Table P-2Default Paths and File Names Default Paths and File Names Table P-3Typographic Conventions Symbol ConventionsSymbol Conventions Typographic Conventions Sun Welcomes Your Comments Documentation, Support, and TrainingThird-Party Web Site References Process Overview 1Performance Tuning Roadmap Performance Tuning Roadmap Performance Tuning Sequence Application Architecture Understanding Operational Requirements Client-Side Presentation Encryption User Authentication and AuthorizationSecurity Requirements Hardware Resources Administration General Tuning Concepts 2Factors That Affect Performance Capacity Planning To Determine Capacity User Expectations Further Information Use StringBuffer to Concatenate Strings Java Programming GuidelinesAvoid Serialization and Deserialization Declare Constants as static final String str = testing str = str + abcAssign null to Variables That Are No Longer Needed Declare Methods as final Only If Necessary Use DataHandlers for Soap Attachments Java Server Page and Servlet TuningSynchronize Only When Necessary Declare Method Arguments final Http Session Handling Suggested Coding PracticesGeneral Guidelines Avoid Shared Modified Class Variables Optimize SSL Configuration and Deployment TipsDisable Security Manager Monitoring EJB Components EJB Performance TuningGoals Following is a sample of the monitoring output Monitoring Individual EJB Components Asadmin get -m monitorableObject Use Caching General GuidelinesUse High Performance Beans Remove Unneeded Stateful Session Beans Using Local and Remote InterfacesCache and Pool Tuning Tips Use the Appropriate Stubs Prefer Local Interfaces Using Pass-By-Reference Semantics Improving Performance of EJB Transactions Version Consistency Using Special TechniquesConfigure Jdbc Resources as One-Phase Commit Resources Use the Least Expensive Transaction Attribute Entity-mapping cmp-field-mapping Cmp-field-mapping consistency To enable request partitioningWhen new.VCVERSIONNUMBER = old.VCVERSIONNUMBER Declare Request Partitioning Stateful Session Beans Tuning Tips for Specific Types of EJB ComponentsEntity Beans Read-Only Entity Beans Checkpoint only when neededStateless Session Beans Refresh period Pre-fetching Container Managed Relationship CMR Beans OrderTable.OrderID = OrderLineTable.OrderLineOrderID Close Connections Jdbc and Database AccessUse Jdbc Directly Encapsulate Business Logic in Entity EJB Components Tune the Message-Driven Bean’s Pool Size Tuning Message-Driven BeansAsadmin set server.mdb-container.max-pool-size = value Use getConnection Limit Use of JMS Connections Cache Bean-Specific Resources Deployment Settings Tuning the Enterprise Server Use Pre-compiled JavaServer Pages Logger SettingsDisable Auto-deployment Disable Dynamic Application Reloading Log Levels Web Container SettingsGeneral Settings Session Properties Session Timeout Manager Properties Reap Interval Disable Dynamic JSP Reloading Overview of EJB Pooling and Caching EJB Container SettingsTuning the EJB Container Monitoring the EJB Container EJB Pool Settings Tuning the EJB Pool EJB Cache Settings Tuning the EJB Cache Pool and Cache Settings for Individual EJB Components Determining the best commit option Commit Option Viewing Monitoring Information Java Message Service SettingsTransaction Service Settings Monitoring the Transaction Service Asadmin get -m serverInstance.transaction-service Tuning the Transaction ServiceDisable Distributed Transaction Logging Keypoint Interval Http Service SettingsMonitoring the Http Service Recover On Restart Automatic Recovery DNS Cache Information dns EnabledList --user admin --port Property name=statsProfilingEnabled value=false NameLookups HitRatioCaching DNS Entries Limit DNS Lookups to Asynchronous Keep Alive keep-alive File Cache Information file-cache Request Processing Tuning the Http ServiceAccess Log Connection Queue Initial Thread Count Request TimeoutThread Count Max Connections Keep AliveBuffer Length Time Out DNS Lookup EnabledHttp Protocol Http File Cache Small/Medium File Size and File Size Limit Max Files CountHash Init Size Max Age Acceptor Threads Tuning Http Listener SettingsNetwork Address Monitoring the ORB ORB SettingsOverview How a Client Connects to the ORB Thread Pools Tuning the ORB3Tunable ORB Settings Connection Statistics ORB Thread Pool Parameters Tunable ORB Parameters Controlling connections between client and server ORB Using multiple connectionsClient ORB Properties Load Balancing Thread Pool SizingExamining Iiop Messages Improving ORB Performance with Java Serialization Using JSG for Application Clients Thread Pool SettingsTuning Thread Pools Unix /Linux only To Enable Java Serialization Monitoring Jdbc Connection Pools Jdbc Connection Pool SettingsTuning Jdbc Connection Pools Resources 4Connection Pool Sizing Pool Size SettingsTimeout Settings Connection Validation Settings Isolation Level Settings Transaction Support Connector Connection Pool Settings Testpool Page Java Virtual Machine Settings Tuning the Java Runtime System Managing Memory and Garbage Collection Tuning the Garbage Collector Additional Information Choosing the Garbage Collection AlgorithmTo use the CMS collector Tracing Garbage Collection Other Garbage Collector Settings 1Maximum Address Space Per Process Tuning the Java HeapGuidelines for Java Heap Sizing Xmsvalue Xmxvalue Heap Tuning Parameters Survivor Ratio Sizing Example 4-1Heap Configuration on SolarisRebasing DLLs on Windows To rebase the Application Server’s DLLs Enter this command rebase -b 0x6000000 *.dll For more information on tuning the JVM, see Page Processors Server Scaling Networking MemoryDisk Space Tuning Parameters Netstat -nP tcpwc -l Sizing the Connection Hash TableNdd -get /dev/tcp tcpconnhash File Descriptor Setting Linux Configuration File Descriptors on IP Stack Settings on Tuning for Solaris on File Descriptors IP Stack Settings Tuning for Linux platforms Session required /lib/security/pamlimits.so Virtual MemorySoft Nofile 65535 Hard Network Interface Disk I/O SettingsTCP/IP Settings To tune the TCP/IP settings Tuning Operating System and TCP Settings Tuning UltraSPARC T1-Based Systems 2Tuning 64-bit Systems for Performance Benchmarking Start Options Disk ConfigurationNetwork Configuration 106 Calculating Hadb Data Device Size Tuning HadbDisk Use Hadbm set TotalDatadeviceSizePerNode Tuning Data Device Size Vmstat -S Memory AllocationPlacing Hadb files on Physical Disks Beware last flush/fputs took too long NodeNo TotalSize FreeSize Usage 512 504 PerformanceDataBufferPoolSize Hadbm set DataBufferPoolSize Tuning DataBufferPoolSizeLogBufferSize Node No Avail Free Size Tuning LogBufferSizeInternalLogbufferSize Hadbm resourceinfo --logbuf Hadbm set InternalLogbufferSize Tuning InternalLogbufferSizeNumberOfLocks Hadbm resourceinfo --nilogbuf Summary Tuning NumberOfLocksCalculating the number of locks Node No Avail Free Waits 50000 TimeoutsJdbc connection pool timeouts Load Balancer timeouts No space left on device Tuning the Enterprise Server for High-AvailabilityOperating System Configuration Hadb timeouts Time-based Tuning Session Persistence FrequencyWeb-method Modified-session Session Persistence ScopeSession Size Session Checkpointing Stateful Session Beans Configuring the Jdbc Connection Pool Enabling the Health Checker Configuring the Load Balancer Tuning for High-Availability 121 122 Index Index 125 Monitoring transaction service Session timeout 128