Consider this simplified pseudocode for Lambda architecture layers:

medium📝 Predict Output Q13 of 15

Hadoop - Modern Data Architecture with Hadoop

batch_result = batch_layer(data)
speed_result = speed_layer(stream)
final_result = merge(batch_result, speed_result)
print(final_result)

If batch_layer returns {'count': 100} and speed_layer returns {'count': 5}, what will final_result be after merging by summing counts?

A{'count': 105}

B{'count': 100}

C{'count': 5}

DError: Cannot merge dictionaries

Step-by-Step Solution

Solution:

Step 1: Understand merging logic
Merging sums the 'count' values from batch and speed results: 100 + 5 = 105.
Step 2: Confirm final result
The final dictionary after merging is {'count': 105}.
Final Answer:
{'count': 105} -> Option A
Quick Check:
100 + 5 = 105 [OK]

Quick Trick: Sum batch and speed counts for final result [OK]

Common Mistakes:

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