Improving Performance via Parallelism in Oracle Event Processing Pipelines with High-Availability by Mauricio Arango

This posting explains how to use parallelism to improve performance of Oracle Event Processing (OEP) applications with active-active high-availability (HA) deployments. Parallelism is exploited for performance gain in each one of the server instances of an HA configuration. This is achieved by identifying sections of an application’s processing pipeline that can operate in parallel, and, therefore, can be mapped to separate processing threads. Both pipeline and independent query parallelism are described.

Pipeline Parallelism

A pipeline architecture has inherent concurrency because each of its stages works in parallel on different data elements flowing through it. For example, in the pipeline in figure 1, if each stage is assigned its own processing thread, the following actions can occur in concurrently: input JMS adapter reads event #3 from a JMS topic, CQL query processor handles event #2, and output JMS adapter writes event #1 to a queue.

Figure 1. OEP Pipeline with three concurrent stages


Although OEP HA pipelines are limited to one thread per stage, significant performance gains can be achieved by running each stage in a separate thread as compared to running all stages on one thread or in a number of threads smaller than the number of pipeline stages.

A key constraint in OEP when using active-active HA (see Oracle Fusion Middleware Developer’s Guide for Oracle Event Processing 11g Release 1 ( for Eclipse, section 24) is that it requires the input streams to both the primary and the secondary instances to be identical and to maintain the same event ordering as events flow through the OEP Event Processing Network (EPN). This constrain limits the EPN topology to be either a linear pipeline, starting from an input adapter and ending with an output adapter, or a tree where, each node with downstream branching replicates every event to each of its branches.

The event ordering requirement also limits to one the number of threads assigned to each stage of the EPN. Having more than one thread in one stage, for example, in an input JMS adapter, would fail to assure that the order of events entering the following stage, such as input channel, is the same in both the primary and secondary instances. Read the complete article here.

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