Elasticsearch - Advanced Patterns
If you want to retrieve 12,000 documents using the Scroll API with a batch size of 400, how many total scroll requests (including the initial search) must you perform?
If you want to retrieve 12,000 documents using the Scroll API with a batch size of 400, how many total scroll requests (including the initial search) must you perform?
hard🚀 Application Q8 of Q15
Step-by-Step Solution
Solution:
Step 1: Calculate total batches
Divide total documents by batch size: 12000 / 400 = 30 batches.Step 2: Count requests
The initial search request returns the first batch, so total requests = number of batches.Step 3: Verify if an extra request is needed
Since 12000 is exactly divisible by 400, 30 batches are needed, but the initial request counts as one, so total requests = 30.Step 4: Reconsider counting
Actually, the initial search is the first request, then 29 scroll requests to get remaining batches, total 30 requests.Final Answer:
30 -> Option BQuick Check:
Total requests = total batches = 30 [OK]
Quick Trick: Total requests equal total batches (ceil division) [OK]
Common Mistakes:
MISTAKES- Adding an extra request unnecessarily
- Not including the initial search request
- Incorrect division without ceiling
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