How do I configure parallel execution of steps in Spring Batch?

We may use split tag to configure parallel steps. In below example, flow1 (step1 and step2 sequence) is executed in parallel with flow2 (step3). Step4 is executed after both flows are complete.

<job id="parallelJob">
    <split id="split1" task-executor="taskExecutor" next="step4">
        <flow>
            <step id="step1" parent="s1" next="step2"/>
            <step id="step2" parent="s2"/>
        </flow>
        <flow>
            <step id="step3" parent="s3"/>
        </flow>
    </split>
    <step id="step4" parent="s4"/>
</job>

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