Spring Batch - the not so hot cousin that gets the (batch) job done

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Spring Batch provides functionality for processing data in batches including chunk-oriented processing, transaction management, job persistence, and error handling. It allows defining jobs as a sequence of steps and processing data in chunks within transactions. Listeners can be used to monitor processing. While Spring Batch is not a scheduler itself, it can be used with schedulers like Quartz to run batch jobs on a schedule.

Software

Copyright©SolidBeansAB
Mattias Jiderhamn www.solidbeans.com
Spring Batch
– the not so hot cousin that gets
the (batch) job done
Mattias Jiderhamn
Solid Beans

Copyright©SolidBeansAB
Mattias Jiderhamn www.solidbeans.com
Hot or Not?

Copyright©SolidBeansAB
Mattias Jiderhamn www.solidbeans.com
Spring Batch provides
• Chunk oriented processing
• Transaction management
• Persistent job state
• Pause/Resume/Restart
• Retry/Skip
• Flow control
• Partitioning (parallel processing)
• JSR-352 implementation

Copyright©SolidBeansAB
Mattias Jiderhamn www.solidbeans.com
Spring Batch is not
• A scheduler
–Quartz (Open Source)
–@EnableScheduling +
@Scheduled
–Control-M
–Autosys
–cron

Copyright©SolidBeansAB
Mattias Jiderhamn www.solidbeans.com
Concepts
Job
Step 1 Step NStep 2
…

Copyright©SolidBeansAB
Mattias Jiderhamn www.solidbeans.com
Concepts
Job
JobParameters+
JobInstance=
Job todaysJob =
new DailyJob(”2018-09-25”)
class DailyJob extends Job {
...
}
JobExecution todaysJob.execute()
Think
*
*

Copyright©SolidBeansAB
Mattias Jiderhamn www.solidbeans.com
Concepts
Job
Step 1
Step N
Step 2
JobInstance JobExecution
StepExecution*
*
* *
*

Copyright©SolidBeansAB
Mattias Jiderhamn www.solidbeans.com
Step
Chunk-oriented processing
ItemWriterItemReader
X
Chunk<X> Chunk<Y>
ItemProcessor
Optional
YX

Copyright©SolidBeansAB
Mattias Jiderhamn www.solidbeans.com
I/O
• Database
• Hibernate
• JDBC
• JPA
• MongoDB
• Neo4J
• Files
• Flat or delimited file
• XML
• Excel (extension)
• JMS
• Mail
• ElasticSearch (extension)

Copyright©SolidBeansAB
Mattias Jiderhamn www.solidbeans.com
Business people ♥ Excel

Copyright©SolidBeansAB
Mattias Jiderhamn www.solidbeans.com
Chunk-oriented processing
ItemReader
.read()
ItemProcessor
.process()
ItemWriter
.write()
Begin
step
Begin
TX
Commit
TX
End
step
!= null &&
n < commitLimit
(chunk size)
More items
!= null

Copyright©SolidBeansAB
Mattias Jiderhamn www.solidbeans.com
Demo

Copyright©SolidBeansAB
Mattias Jiderhamn www.solidbeans.com
Error
ItemReader
.read()
ItemProcessor
.process()
ItemWriter
.write()
Begin
step
Begin
TX
Commit
TX
End
step
Rollback
TX
RuntimeException RuntimeException RuntimeException

Copyright©SolidBeansAB
Mattias Jiderhamn www.solidbeans.com
Error handling

Copyright©SolidBeansAB
Mattias Jiderhamn www.solidbeans.com
Retryable error
ItemReader
.read()
ItemProcessor
.process()
ItemWriter
.write()
Begin
step
Begin
TX
Commit
TX
End
step
Rollback
TX
RetryException
Begin
TX
>= retryLimit

Copyright©SolidBeansAB
Mattias Jiderhamn www.solidbeans.com
Skippable error in ItemReader
ItemReader
.read()
ItemProcessor
.process()
ItemWriter
.write()
Begin
step
Begin
TX
Commit
TX
End
step
SkippableException
>= skipLimit
Rollback
TX

Copyright©SolidBeansAB
Mattias Jiderhamn www.solidbeans.com
Skippable error in ItemProcessor
ItemReader
.read()
ItemProcessor
.process()
ItemWriter
.write()
Begin
step
Begin
TX
Commit
TX
End
step
SkippableException
Rollback
TX
Remove failed
item from chunk
>= skipLimit
Begin
TX

Copyright©SolidBeansAB
Mattias Jiderhamn www.solidbeans.com
Skippable error in ItemWriter
ItemReader
.read()
ItemProcessor
.process()
ItemWriter
.write()
Begin
step
Begin
TX
Commit
TX
End
step
Rollback
TX
SkippableException
For each item
in chunk
Begin
TX
>= skipLimit
Iteration
complete Skip
SkippableException

Copyright©SolidBeansAB
Mattias Jiderhamn www.solidbeans.com
Listeners

Copyright©SolidBeansAB
Mattias Jiderhamn www.solidbeans.com
StepExecutionListener
ItemReader
.read()
ItemProcessor
.process()
ItemWriter
.write()
Begin
step
Begin
TX
Commit
TX
End
step
beforeStep()
afterStep()

Copyright©SolidBeansAB
Mattias Jiderhamn www.solidbeans.com
ChunkListener
ItemReader
.read()
ItemProcessor
.process()
ItemWriter
.write()
Begin
step
Begin
TX
Commit
TX
End
step
beforeChunk()
afterChunk

Copyright©SolidBeansAB
Mattias Jiderhamn www.solidbeans.com
ItemReadListener
ItemReader
.read()
ItemProcessor
.process()
ItemWriter
.write()
Begin
step
Begin
TX
Commit
TX
End
step
Rollback
TX
beforeRead()
afterRead()
onReadError()

Copyright©SolidBeansAB
Mattias Jiderhamn www.solidbeans.com
ItemProcessListener
ItemReader
.read()
ItemProcessor
.process()
ItemWriter
.write()
Begin
step
Begin
TX
Commit
TX
End
step
Rollback
TX
beforeProcess()
afterProcess()
onProcessError()

Copyright©SolidBeansAB
Mattias Jiderhamn www.solidbeans.com
ItemWriteListener
ItemReader
.read()
ItemProcessor
.process()
ItemWriter
.write()
Begin
step
Begin
TX
Commit
TX
End
step
Rollback
TX
beforeWrite()
afterWrite()
onWriteError()

Copyright©SolidBeansAB
Mattias Jiderhamn www.solidbeans.com
More listeners
• SkipListener
– onSkipInRead()
– onSkipInProcess()
– onSkipInWrite()
JSR-352 listeners
• RetryReadListener.onRetryReadException()
• RetryProcessListener.onRetryProcessException()
• RetryWriteListener.onRetryWriteException()

Copyright©SolidBeansAB
Mattias Jiderhamn www.solidbeans.com
Conditional steps

Copyright©SolidBeansAB
Mattias Jiderhamn www.solidbeans.com
Flow control
Job
Step A
Step C
Step B
FAILED
Success

Copyright©SolidBeansAB
Mattias Jiderhamn www.solidbeans.com
Gotchas
• Transactional ItemReader and skip/retry
– readerIsTransactionalQueue()
• Listeners and transactions
– @Transactional(propagation=Propagation.REQUIRES_NEW)
• ExitStatus.equals() vs ExitStatus.compareTo()
• Restart vs relaunch
– Restart = start the same JobIntance again
– Relaunch = new JobInstance
• Must not use the same (identifying) job parameters

Copyright©SolidBeansAB
java.jiderhamn.se
github.com/mjiderhamn/spring-batch-demo
@mjiderhamn

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Spring Batch - the not so hot cousin that gets the (batch) job done

3. Copyright©SolidBeansAB Mattias Jiderhamn www.solidbeans.com Spring Batch provides • Chunk oriented processing • Transaction management • Persistent job state • Pause/Resume/Restart • Retry/Skip • Flow control • Partitioning (parallel processing) • JSR-352 implementation

6. Copyright©SolidBeansAB Mattias Jiderhamn www.solidbeans.com Concepts Job JobParameters+ JobInstance= Job todaysJob = new DailyJob(”2018-09-25”) class DailyJob extends Job { ... } JobExecution todaysJob.execute() Think * *

9. Copyright©SolidBeansAB Mattias Jiderhamn www.solidbeans.com I/O • Database • Hibernate • JDBC • JPA • MongoDB • Neo4J • Files • Flat or delimited file • XML • Excel (extension) • JMS • Mail • ElasticSearch (extension)

11. Copyright©SolidBeansAB Mattias Jiderhamn www.solidbeans.com Chunk-oriented processing ItemReader .read() ItemProcessor .process() ItemWriter .write() Begin step Begin TX Commit TX End step != null && n < commitLimit (chunk size) More items != null

13. Copyright©SolidBeansAB Mattias Jiderhamn www.solidbeans.com Error ItemReader .read() ItemProcessor .process() ItemWriter .write() Begin step Begin TX Commit TX End step Rollback TX RuntimeException RuntimeException RuntimeException

15. Copyright©SolidBeansAB Mattias Jiderhamn www.solidbeans.com Retryable error ItemReader .read() ItemProcessor .process() ItemWriter .write() Begin step Begin TX Commit TX End step Rollback TX RetryException Begin TX >= retryLimit

16. Copyright©SolidBeansAB Mattias Jiderhamn www.solidbeans.com Skippable error in ItemReader ItemReader .read() ItemProcessor .process() ItemWriter .write() Begin step Begin TX Commit TX End step SkippableException >= skipLimit Rollback TX

17. Copyright©SolidBeansAB Mattias Jiderhamn www.solidbeans.com Skippable error in ItemProcessor ItemReader .read() ItemProcessor .process() ItemWriter .write() Begin step Begin TX Commit TX End step SkippableException Rollback TX Remove failed item from chunk >= skipLimit Begin TX

18. Copyright©SolidBeansAB Mattias Jiderhamn www.solidbeans.com Skippable error in ItemWriter ItemReader .read() ItemProcessor .process() ItemWriter .write() Begin step Begin TX Commit TX End step Rollback TX SkippableException For each item in chunk Begin TX >= skipLimit Iteration complete Skip SkippableException

20. Copyright©SolidBeansAB Mattias Jiderhamn www.solidbeans.com StepExecutionListener ItemReader .read() ItemProcessor .process() ItemWriter .write() Begin step Begin TX Commit TX End step beforeStep() afterStep()

21. Copyright©SolidBeansAB Mattias Jiderhamn www.solidbeans.com ChunkListener ItemReader .read() ItemProcessor .process() ItemWriter .write() Begin step Begin TX Commit TX End step beforeChunk() afterChunk

22. Copyright©SolidBeansAB Mattias Jiderhamn www.solidbeans.com ItemReadListener ItemReader .read() ItemProcessor .process() ItemWriter .write() Begin step Begin TX Commit TX End step Rollback TX beforeRead() afterRead() onReadError()

23. Copyright©SolidBeansAB Mattias Jiderhamn www.solidbeans.com ItemProcessListener ItemReader .read() ItemProcessor .process() ItemWriter .write() Begin step Begin TX Commit TX End step Rollback TX beforeProcess() afterProcess() onProcessError()

24. Copyright©SolidBeansAB Mattias Jiderhamn www.solidbeans.com ItemWriteListener ItemReader .read() ItemProcessor .process() ItemWriter .write() Begin step Begin TX Commit TX End step Rollback TX beforeWrite() afterWrite() onWriteError()

25. Copyright©SolidBeansAB Mattias Jiderhamn www.solidbeans.com More listeners • SkipListener – onSkipInRead() – onSkipInProcess() – onSkipInWrite() JSR-352 listeners • RetryReadListener.onRetryReadException() • RetryProcessListener.onRetryProcessException() • RetryWriteListener.onRetryWriteException()

28. Copyright©SolidBeansAB Mattias Jiderhamn www.solidbeans.com Gotchas • Transactional ItemReader and skip/retry – readerIsTransactionalQueue() • Listeners and transactions – @Transactional(propagation=Propagation.REQUIRES_NEW) • ExitStatus.equals() vs ExitStatus.compareTo() • Restart vs relaunch – Restart = start the same JobIntance again – Relaunch = new JobInstance • Must not use the same (identifying) job parameters

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