Analysis of the Hopping Window Solution

Goal Requirements:

• Count tweets in each 10-second window
• Ensure each tweet is counted only once

Hopping Window Behavior:

A hopping window with 5-second hop size and 10-second window size creates overlapping windows that advance every 5 seconds. This means:

• Window 1: 0-10 seconds
• Window 2: 5-15 seconds
• Window 3: 10-20 seconds
• And so on...

Problem with Overlapping Windows:

• Tweets occurring between 5-10 seconds would be counted in both Window 1 and Window 2
• Tweets occurring between 10-15 seconds would be counted in both Window 2 and Window 3
• This violates the requirement that each tweet must be counted only once

Correct Window Type for This Scenario:

A tumbling window with 10-second intervals would be the appropriate choice because:

• Tumbling windows are non-overlapping
• Each tweet falls into exactly one 10-second window
• No duplication of tweet counts occurs
• Meets both requirements: counting in each 10-second window AND ensuring each tweet is counted once

Why This Solution Fails:

The hopping window with 5-second hop creates 50% overlap between consecutive windows, causing tweets in the overlapping regions to be counted multiple times. This fundamentally contradicts the "counted only once" requirement.

Conclusion: The solution does NOT meet the goal because the overlapping nature of the hopping window causes tweet duplication.