Lifecycle Callback Annotations Lifecycle
20.1.1 High Availability Lifecycle and Failover
Figure 20–2 shows a state diagram for the Oracle CEP high availability lifecycle. In this diagram, the state names SECONDARY, BECOMING_PRIMARY, and PRIMARY correspond to the Oracle CEP high availability adapter RuntimeMBean method getState return values. These states are specific to Oracle CEP. Figure 20–2 Oracle CEP High Availability Lifecycle State Diagram It is not possible to specify the server that will be the initial primary. Initially, the first server in the multi-server domain to start up becomes the primary so by starting servers in a particular order, you can influence primary selection. There is no way to force a particular, running server to become the primary. If a primary fails, and then comes back up, it will not automatically become the primary again unless the current primary fails causing a failover. This section describes the Oracle CEP high availability lifecycle in more detail, including: ■ Section 20.1.1.1, Secondary Failure Understanding High Availability 20-3 ■ Section 20.1.1.2, Primary Failure and Failover ■ Section 20.1.1.3, Rejoining the High Availability Multi-Server Domain20.1.1.1 Secondary Failure
In general, when a secondary server fails, there is no effect on Oracle CEP application operation as Figure 20–3 shows. Regardless of the quality of service you choose, there are no missed or duplicate events. Figure 20–3 Secondary Failure20.1.1.2 Primary Failure and Failover
However, when a primary server fails, as Figure 20–4 shows, Oracle CEP performs a failover that may cause missed or duplicate events, depending on the quality of service you choose. Figure 20–4 Primary Failure and Failover During failover, Oracle CEP automatically selects a new primary and the new primary transitions from the SECONDARY state to the BECOMING_PRIMARY state. Depending on the quality of service you choose, the new primary will not transition to PRIMARY state until a configurable readiness threshold is met. For details, see the specific quality of service option in Section 20.2, Choosing a Quality of Service .20.1.1.3 Rejoining the High Availability Multi-Server Domain
When a new Oracle CEP server is added to an Oracle CEP high availability multi-server domain or an existing failed server restarts, the server will not have fully joined the Oracle CEP high availability deployment and notification groups until all applications deployed to it have fully joined. The type of application determines when it can be said to have fully joined. 20-4 Oracle Complex Event Processing Developers Guide If the application must generate exactly the same sequence of output events as existing secondaries a Type 1 application, then it must be able to rebuild its internal state by processing input streams for some finite period of time the warm-up-window period. This warm-up-window time determines the minimum time it will take for the application to fully join the Oracle CEP high availability deployment and notification groups. If the application does not need to generate exactly the same sequence of output events as existing secondaries a Type 2 application, then it does not require a warm-up-window time and will fully join the Oracle CEP high availability deployment and notification groups as soon as it is deployed. For more information, see Section 20.3.2.5, Choose an Adequate warm-up-window Time .20.1.2 Deployment Group and Notification Group
All the servers in the multi-server domain belong to the same deployment group: this is the group to which you deploy an application. For the purposes of Oracle CEP high availability, you must deploy the same application to all the servers in this group. By default, all the servers in the multi-server domain also belong to the same notification group. The servers listen to the notification group for membership notifications that indicate when a server has failed and exited the group or resumed operation and rejoined the group, as well as for synchronization notifications from the primary. If you need to scale your Oracle CEP high availability application, you can use the ActiveActiveGroupBean to define a notification group that allows two or more servers to function as a primary server unit while retaining the convenience of a single deployment group that spans all servers primaries and secondaries. You must use Oracle Coherence-based clustering to create the multi-server domain deployment group. You may use either default groups or custom groups. For more information, see: ■ Section 20.1.4, High Availability and Scalability ■ Section 20.1.5, High Availability and Oracle Coherence ■ How to Create an Oracle CEP Multi-Server Domain With Default Groups Using Oracle Coherence in the Oracle Complex Event Processing Administrators Guide. ■ How to Create an Oracle CEP Multi-Server Domain With Custom Groups Using Oracle Coherence in the Oracle Complex Event Processing Administrators Guide.20.1.3 High Availability Components
To implement Oracle CEP high availability options, you configure your Event Processing Network EPN with a high availability input adapter after each input adapter and a high availability output adapter before each output adapter. Figure 20–5 shows a typical EPN with all possible high availability adapters in place. Understanding High Availability 20-5 Figure 20–5 High Availability Adapters in the EPN The optional high availability input adapter in the primary communicates with the corresponding high availability input adapters in each secondary to normalize event timestamps. Oracle CEP high availability provides one type of high availability input adapter. See Section 20.1.3.1, High Availability Input Adapter . The high availability output adapter in the primary is responsible for outputting events to the output streams that connect the Oracle CEP application to its downsteam client. The high availability output adapter in the primary also communicates with the corresponding high availability output adapters in each secondary, and, depending on the high availability quality of service you choose, may instruct the secondary output adapters to trim their in-memory queues of output events. Oracle CEP high availability provides the following high availability output adapters: ■ Section 20.1.3.2, Buffering Output Adapter ■ Section 20.1.3.3, Broadcast Output Adapter ■ Section 20.1.3.4, Correlating Output Adapter Oracle CEP high availability also provides a notification groups Spring bean to increase scalability in JMS applications. See Section 20.1.3.5, ActiveActiveGroupBean . Which adapter you choose is determined by the high availability quality of service you choose. See Section 20.2, Choosing a Quality of Service . Note: For simplicity, Figure 20–5 does not show channels and shows only one processor. However, the EPN may be arbitrarily complex with multiple input streams and output streams, channels, multiple processors, event beans, and so on. The only restriction is that each input adapter must be followed by a high availability input adapter and each output adapter must be preceded by a high availability output adapter. Similarly, for simplicity, a multi-server domain of only two Oracle CEP servers is shown but you may have an arbitrary number of secondary servers. 20-6 Oracle Complex Event Processing Developers Guide20.1.3.1 High Availability Input Adapter
The optional Oracle CEP high availability input adapter on the primary Oracle CEP server assigns a time in nanoseconds to events as they arrive at the adapter and forwards the time values assigned to events to all secondary servers. This ensures that all servers running the application use a consistent time value and generate the same results and avoids the need for distributed clock synchronization. Since a time value is assigned to each event before the event reaches any downstream channels in the EPN, downstream channels should be configured to use application time so that they do not assign a new time value to events as they arrive at the channel. Input events must have a key that uniquely identifies each event in order to use this adapter. You can configure the Oracle CEP high availability input adapter to send heartbeat events. The Oracle CEP high availability input adapter is applicable to all high availability quality of service options. However, because the high availability input adapter increases performance overhead, it is not appropriate for some high availability quality of service options such as Section 20.2.1, Simple Failover and Section 20.2.2, Simple Failover with Buffering . For these options, you should instead consider using application time with some incoming event property. For more information, see: ■ Section 20.2.3, Light-Weight Queue Trimming ■ Section 20.2.4, Precise Recovery with JMS ■ Section 21.2.1, How to Configure the High Availability Input Adapter .20.1.3.2 Buffering Output Adapter
The Oracle CEP high availability buffering output adapter implements a buffered queue trimming strategy. The buffer is a sliding window of output events from the stream. The size of the window is measured in milliseconds. The Oracle CEP high availability buffering output adapter is applicable to simple failover and simple failover with buffering high availability quality of service options. For more information, see: ■ Section 20.2.1, Simple Failover ■ Section 20.2.2, Simple Failover with Buffering ■ Section 21.2.2, How to Configure the Buffering Output Adapter .20.1.3.3 Broadcast Output Adapter
The Oracle CEP high availability broadcast output adapter implements a distributed queue trimming strategy. The active primary instance broadcasts messages to the active secondary instances in the notification group telling them when to trim their local representation of the queue. The Oracle CEP high availability broadcast output adapter is applicable to the light-weight queue trimming high availability quality of service option. For more information, see: ■ Section 20.2.3, Light-Weight Queue TrimmingParts
» Oracle Fusion Middleware Online Documentation Library
» Adapter Components of the Oracle CEP Event Processing Network
» Channel Processor Components of the Oracle CEP Event Processing Network
» Event Bean Components of the Oracle CEP Event Processing Network
» Spring Bean Cache Components of the Oracle CEP Event Processing Network
» Table Nested Stages Components of the Oracle CEP Event Processing Network
» Foreign Stages Components of the Oracle CEP Event Processing Network
» Streams and Relations Transmitting Events in the EPN: Stream and Relation Sources and Sinks
» Transmitting Events in the EPN: Examples
» EPN Assembly File Overview of the Oracle CEP Programming Model
» Component Configuration Files Overview of the Oracle CEP Programming Model
» High Availability and Scalability
» Oracle CEP calls the ResumableBean.beforeResume method on all
» For each bean that implements RunnableBean, Oracle CEP starts it running in a
» Application state is now RUNNING.
» User Action: Uninstall Application
» User Action: Update Application
» User Action: Calling Methods of Stream and Relation Sources and Sinks
» Oracle CEP APIs Overview of the Oracle CEP Programming Model
» Creating an Oracle CEP Application
» Static Resource Names Static Resource Injection
» Dynamic Resource Names Static Resource Injection
» Dynamic Resource Injection Dynamic Resource Lookup Using JNDI
» Next Steps Oracle Fusion Middleware Online Documentation Library
» Event Type Instantiation and Immutability
» Event Types Specified as JavaBean or Java Class
» Event Types Specified as java.util.Map Event Types Specified as a Tuple
» Event Types for use With a Database Table Source
» Event Types for use With the csvgen Adapter
» Event Type and Serialization Creating Oracle CEP Event Types
» How to Create an Oracle CEP Event Type as a JavaBean Using the Event Type Repository Editor
» How to Create an Oracle CEP Event Type as a JavaBean Manually
» How to Create an Oracle CEP Event Type as a Tuple Using the Event Type Repository Editor
» How to Create an Oracle CEP Event Type as a Tuple Manually
» How to Create an Oracle CEP Event Type as a Java Class Manually
» How to Create an Oracle CEP Event Type as a java.util.Map
» Using an Event Type Builder Factory
» Sharing Event Types Between Application Bundles
» Installing the Latest Oracle CEP IDE for Eclipse
» Installing the Oracle CEP IDE for Eclipse Distributed With Oracle CEP
» Configuring Eclipse Oracle Fusion Middleware Online Documentation Library
» How to Create an Oracle CEP Project
» Oracle CEP Project Overview Select File New Other.
» How to Export an Oracle CEP Project
» In the Binary Build area, check the resources you want exported with your
» How to Add a Standard JAR File to an Oracle CEP Project
» How to Export a Package How to Import a Package
» How to Create a Remote Oracle CEP Server and Server Runtime
» How to Create an Oracle CEP Server Runtime
» How to Start a Local Oracle CEP Server
» How to Deploy an Application to an Oracle CEP Server
» How to Configure Connection and Control Settings for Oracle CEP Server
» How to Configure Domain Runtime Settings for Oracle CEP Server
» How to Start the Oracle CEP Visualizer from Oracle CEP IDE for Eclipse
» Right-click a server in the Servers view and select Debug.
» How to Open the EPN Editor from a Project Folder
» How to Open the EPN Editor from a Context or Configuration File
» Flow Representation Filtering EPN Editor Overview
» Zooming Layout Showing and Hiding Unconnected Beans
» Printing and Exporting to an Image Configuration Badging
» Link Specification Location Indicator
» Nested Stages EPN Editor Overview
» Event Type Repository Editor
» Hyperlinking in Component Configuration and EPN Assembly Files
» Hyperlinking in Oracle CQL Statements
» Type the keyboard short cut Ctrl-Alt-T.
» Right-click on an empty portion of the EPN Editor surface and select New from
» Laying Out Nodes Renaming Nodes Deleting Nodes
» Conversion Between JMS Messages and Event Types
» JMS Service Providers Outbound JMS Adapter
» How to Configure a JMS Adapter Using the Oracle CEP IDE for Eclipse
» How to Configure a JMS Adapter Manually
» How to Configure a JMS Adapter for Oracle WebLogic Server JMS Manually
» How to Configure a JMS Adapter for Tibco EMS JMS Manually
» How to Create a Custom Converter for the Inbound JMS Adapter
» How to Create a Custom Converter for the Outbound JMS Adapter
» How to Encrypt Passwords in the JMS Adapter Component Configuration File
» JMS Inbound Adapter EPN Assembly File Configuration
» JMS Outbound Adapter EPN Assembly File Configuration
» JMS Inbound Adapter Component Configuration
» JMS Outbound Adapter Component Configuration
» Local Publishing Overview of the Built-In Pub-Sub Adapter for Publishing
» Remote Publishing Overview of the Built-In Pub-Sub Adapter for Publishing
» Overview of the Built-In Pub-Sub Adapter for Subscribing
» Converting Between JSON Messages and Event Types
» How to Configure an HTTP Pub-Sub Adapter Using the Oracle CEP IDE for Eclipse
» How to Configure an HTTP Pub-Sub Adapter Manually
» HTTP Pub-Sub Adapter for Publising EPN Assembly File Configuration
» HTTP Pub-Sub Adapter for Subscribing EPN Assembly File Configuration
» HTTP Pub-Sub Adapter for Publising Component Configuration
» HTTP Pub-Sub Adapter for Subscribing Component Configuration
» Channels as Streams Channels Representing Streams and Relations
» Channels as Relations Channels Representing Streams and Relations
» System-Timestamped Channels Application-Timestamped Channels
» Controlling Which Queries Output to a Downstream Channel: selector
» Batch Processing Channels Overview of Channel Configuration
» EventPartitioner Channels Overview of Channel Configuration
» How to Configure a System-Timestamped Channel Using Oracle CEP IDE for Eclipse
» How to Configure an Application-Timestamped Channel Using Oracle CEP IDE for Eclipse
» How to Create a Channel Component Configuration File Manually
» Channel Component Configuration File Channel EPN Assembly File
» How to Configure an Oracle CQL Processor Using Oracle CEP IDE for Eclipse
» How to Create an Oracle CQL Processor Component Configuration File Manually
» How to Configure an Oracle CQL Processor Table Source Using Oracle CEP IDE for Eclipse
» Oracle CQL Processor Component Configuration File
» Oracle CQL Processor EPN Assembly File
» Configuring an Oracle CQL Processor Cache Source Overview of EPL Processor Component Configuration
» How to Configure an EPL Processor Manually
» Configuring an EPL Processor Cache Source
» EPL Processor Component Configuration File
» EPL Processor EPN Assembly File
» Use Case: Publishing Events to a Cache
» Use Case: Consuming Data From a Cache
» Use Case: Updating and Deleting Data in a Cache
» Use Case: Using a Cache in a Multi-Server Domain
» Additional Caching Features Overview of Oracle CEP Cache Configuration
» Caching APIs Overview of Oracle CEP Cache Configuration
» Specifying the Key Used to Index an Oracle CEP Local Cache
» Configuring an Oracle CEP Local Cache as an Event Source
» Configuring an Oracle CEP Local Cache Loader
» Configuring an Oracle CEP Local Cache Store
» The coherence-cache-config.xml File
» The tangosol-coherence-override.xml File
» Specifying the Key Used to Index an Oracle Coherence Cache
» Configuring an Oracle Coherence Cache as an Event Source
» Configuring an Oracle Coherence Cache Loader
» Configuring an Oracle Coherence Cache Store
» Configuring a Third-Party Caching System and Cache
» How to Access a Cache From an Oracle CQL Statement
» How To Access a Cache From an EPL Statement
» Accessing a Cache From an Adapter
» How to Access a Cache With JMX Using Oracle CEP Visualizer
» How to Access a Cache With JMX Using Java
» Default Persistent Event Store
» Custom Persistent Event Store
» Persistent Event Store Schema
» Querying Stored Events Overview of Configuring Event Record and Playback
» Configuring an Event Store for Oracle CEP Server
» Configuring a Component to Record Events
» Configuring a Component to Playback Events
» Starting and Stopping the Record and Playback of Events
» Description of the Berkeley Database Schema
» Accessing a Cache From an EPL User-Defined Function Creating a Custom Event Store Provider
» Custom Adapters as Event Sources Custom Adapters as Event Sinks
» How to Implement a Custom Adapter Using Ant
» Implementing a Custom Adapter as an Event Source
» Implementing a Custom Adapter as an Event Sink
» Implementing a Custom Adapter Factory
» How to Pass Static Login Credentials to the Data Feed Provider
» How to Pass Dynamic Login Credentials to the Data Feed Provider
» Configuring the Custom Adapter Component Configuration File
» Custom Event Beans as Event Sources
» Custom Event Beans as Event Sinks
» Implementing a Custom Event Bean as an Event Source
» Implementing a Custom Event Bean as an Event Sink
» Configuring the Custom Event Bean Component Configuration File
» Implementing a Custom Spring Bean as an Event Source
» Implementing a Custom Spring Bean as an Event Sink
» Declaring the Custom Spring Bean Components in your Application
» How to Expose an Oracle CEP Application as a Web Service
» How to Configure Oracle JDBC Data Cartridge Application Context
» Extending Component Configuration Using Annotations
» Extending Component Configuration Using an XSD
» How to Extend Component Configuration Using Annotations
» Creating the XSD Schema File
» Lifecycle Callback Annotations Lifecycle
» Rejoining the High Availability Multi-Server Domain
» Deployment Group and Notification Group
» High Availability Input Adapter
» Buffering Output Adapter High Availability Components
» Broadcast Output Adapter High Availability Components
» Correlating Output Adapter ActiveActiveGroupBean
» High Availability and Oracle Coherence
» Simple Failover Choosing a Quality of Service
» Simple Failover with Buffering
» Light-Weight Queue Trimming Choosing a Quality of Service
» Primary Oracle CEP High Availability Use Case
» Select the Minimum High Availability Your Application can Tolerate
» Use Oracle CEP High Availability Components at All Ingress and Egress Points
» Choose an Adequate warm-up-window Time Ensure Applications are Idempotent
» Source Event Identity Externally Understand the Importance of Event Ordering
» Range-Based Windows Oracle CQL Query Restrictions
» Tuple-Based Windows Oracle CQL Query Restrictions
» Partitioned Windows Oracle CQL Query Restrictions
» Sliding Windows Oracle CQL Query Restrictions
» DURATION Clause and Non-Event Detection
» Prefer Application Time Oracle CQL Query Restrictions
» How to Configure Simple Failover
» How to Configure Simple Failover With Buffering
» How to Configure Light-Weight Queue Trimming
» How to Configure Precise Recovery With JMS
» High Availability Input Adapter EPN Assembly File Configuration
» High Availability Input Adapter Component Configuration File Configuration
» Broadcast Output Adapter EPN Assembly File Configuration
» Broadcast Output Adapter Component Configuration File Configuration
» Correlating Output Adapter EPN Assembly File Configuration
» Correlating Output Adapter Component Configuration File Configuration
» How to Configure Scalability With the Default Channel EventPartitioner
» How to Configure Scalability With a Custom Channel EventPartitioner
» How to Configure Scalability in a JMS Application Without Oracle CEP High Availability
» How to Configure Scalability in a JMS Application With Oracle CEP High Availability
» How to Configure the ActiveActiveGroupBean Group Pattern Match
» Applications Overview of Application Assembly and Deployment
» Private Application Dependencies Application Dependencies
» Shared Application Dependencies Application Dependencies
» Library Directory Application Libraries
» Library Extensions Directory Application Libraries
» Creating Application Libraries Application Libraries
» Deployment and Deployment Order
» Configuration History Management Overview of Application Assembly and Deployment
» Assembling an Oracle CEP Application Using Oracle CEP IDE for Eclipse
» Creating the MANIFEST.MF File
» Assembling Applications With Foreign Stages
» How to Assemble a Custom Adapter in its Own Bundle
» How to Assemble a Custom Event Bean in its Own Bundle
» Click OK. How to Configure an Absolute Path
» How to Update an Application Library Using Oracle CEP IDE for Eclipse
» How to View an Application Library Using the Oracle CEP Visualizer
» Message Catalog Hierarchy Using Message Catalogs With Oracle CEP Server
» Guidelines for Naming Message Catalogs
» Using Message Arguments Using Message Catalogs With Oracle CEP Server
» Message Catalog Formats Using Message Catalogs With Oracle CEP Server
» Message Catalog Localization Using Message Catalogs With Oracle CEP Server
» How to Parse a Message Catalog to Generate Logger and TextFormatter Classes for Localization
» How to Deploy an Oracle CEP Application Using Oracle CEP IDE for Eclipse
» How to Deploy an Oracle CEP Application Using Oracle CEP Visualizer
» How to Deploy an Oracle CEP Application Using the Deployer Utility
» Overview of Testing Applications With the Load Generator and csvgen Adapter
» Configuring and Running the Load Generator Utility
» Creating a Load Generator Property File
» Configuring the csvgen Adapter in Your Application
» Event Inspector HTTP Publish-Subscribe Channel and Server
» How to Trace Events Using Oracle CEP Visualizer
» Scalability Using the ActiveActiveGroupBean
» Host Configuration High Availability Performance Tuning
» High Availability Input Adapter and Quality of Service
» High Availability Input Adapter Configuration
» Broadcast Output Adapter Configuration
» Oracle Coherence Heartbeat Frequency
» Oracle Coherence Serialization Oracle Coherence Performance Tuning Options
» Adapter Lifecycle Annotations OSGi Service Reference Annotations
» Example com.bea.wlevs.configuration.Activate
» Example com.bea.wlevs.configuration.Rollback
Show more