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@sdoscher I am not 100% sure if I understand your requirement correctly, but as per my understanding you can read execl#2 parallelly then parse it .After that do a join (inner/outer or left outer) just before your mapper by your key element from both execl1 and excel 2. Then use mapper for creating new set of data whatever is required.
Thank you so much @Supratim. Let me try that approach. I appreciate your feedback.