Out of the Box
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Massive scale on commodity hardware in hours of easy set up
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Battle tested, many bugs worked out, lots of docs, tools, guides, etc.
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Operate JVM, hard not to code on JVM
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Any and all problems associated with any of the boxes or how they fit together
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And these are open source! Many boxes are not and suffer vendor lock-in
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At mercy of those who understand it / time for fixing bugs, making improvements