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The parser pods suffer from OOM kills when processing large PDF documents. The root cause is in api/db/services/task_service.py: when layout_recognize is not DeepDOC (e.g. Plain Text), page_size was set to MAXIMUM_TASK_PAGE_NUMBER (100 million), causing the entire PDF to be processed as a single task with all pages loaded into memory simultaneously. This PR fixes the issue by paginating non-DeepDOC PDF parsing tasks the same way DeepDOC already does.