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Open Source Workflow Engines Written in Java » Concurrent processing of splits? » concurrent processing » why? concurrent != threads? »
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Yes as this system process is responsible for breaking up a large collection into chunks that can be processed (approximately) in parallel, thereby shortening the execution time for that section of the workflow flow.
if you want to control how it's done, then choose an [open source] implementation that satisfies you or implement it yourself. Else stay at your abstraction level.