Batch ProcessingORA/J

Agenda

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Batch principles

Characteristics

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Batch processing ≠ Scheduling

Batch processing Scheduling

Process large volumes of data Scheduling tasks

eg. Spring Batch, JEE eg. Quartz, Obsidian

Things to consider

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Essential building blocks

Categorize based on responsibility

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Categorize based on input source

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Guidelines

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Transaction Management

ACID principle

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Transactions are handled at the step level

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Transaction management in steps (tasklets)

Step 1

Step 2

Step 3

Transaction

Transaction

Transaction x nn

Example: chunk-oriented step

<step id="importProductsStep"> <tasklet> <chunk reader="reader" writer="writer" commit-interval="100" /> <transaction-attributes isolation="READ_UNCOMMITTED" /> </tasklet> </step>

Transaction

Transaction management in listeners

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▪ ChunkListener

beforeChunk afterChunk

Transactional reader

<step id="importProductsStep"> <tasklet> <chunk reader="reader" writer="writer" commit-interval="100" reader-transactional-queue="true"/> <transaction-attributes isolation="READ_UNCOMMITTED" /> </tasklet></step>

Transaction management patterns

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Transaction management patterns

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Transaction management patterns

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Global transactions implementation

Drawbacks to global transactions

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Shared resource transaction pattern

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Best effort pattern with JMS

What can go wrong with JMS?

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Best effort pattern with JMS

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Chunk localtransaction

JMS localtransaction

timeline

Commits are synchronized

<bean id="jmsTemplate" class="org.springframework.jms.core.JmsTemplate"> <property name="connectionFactory" ref="connectionFactory" /> <property name="defaultDestination" ref="orderQueue" /> <property name="receiveTimeout" value="100" /> <property name="sessionTransacted" value="true" /></bean>

JMS failure will result in a duplicate message

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Chunk localtransaction

JMS localtransaction

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Commits are synchronized

failed

Handling duplicate messages with manual detection

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Handling duplicate messages with manual detection

Handling duplicate messages with idempotency

Conclusions

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Execution flows

Execution flows

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Standard flow

Conditional flow - example

Conditional flow

Conditional flow

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ExitStatus vs BatchStatus

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Custom Exitstatus

Custom Batchstatus

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Custom Batchstatus

Parallel execution

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Parallel execution - types

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Parallel execution - Multithreaded

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Parallel execution - Remote chunking

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Parallel execution - Step partitioning

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Parallel execution - Step partitioning

Parallel execution - Step partitioning example

Demo: Speeder problem

Introduction

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Introduction

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Introduction

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Generating input

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Reading the input

Reading the input

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Processing the data

Processing the lines we just read

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▪ KmPerHourCalculator

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Writing the data

Writing the Fines

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▪ BeanWrapperFieldExtractor

DelimitedLineAggregator

Adding it all together

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▪ BatchConfiguration

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▪ Step

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Listening in

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Gathering statistics

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▪ StepExecutionContext

JobExecutionContext

Gathering Statistics

Spring Batch and JEE

JSR-352

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JSR-352 Enterprise

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JSR-352 spring

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org.springframework.batch.core.

SkipListener#onSkipInWrite(S item, Throwable t)

javax.batch.api.chunk.listener.

SkipWriteListener#onSkipWriteItem(List<Object> items,

Exception ex)

JSR-352 Spring vs. JEE

Questions?