Elasticsearch - Performance and Scaling
What does the
fielddata cache in Elasticsearch primarily store?What does the fielddata cache in Elasticsearch primarily store?
easy🧠 Conceptual Q1 of Q15
Step-by-Step Solution
Solution:
Step 1: Understand the role of fielddata cache
The fielddata cache holds in-memory data structures that Elasticsearch builds to enable sorting and aggregations on text fields, which are not stored in a directly sortable format.Step 2: Differentiate from other caches
Query cache stores results of queries, stored documents are on disk, and index metadata is unrelated to fielddata cache.Final Answer:
In-memory data structures for sorting and aggregations on text fields -> Option BQuick Check:
Fielddata cache = In-memory structures for sorting [OK]
Quick Trick: Fielddata cache helps sorting/aggregations on text fields [OK]
Common Mistakes:
MISTAKES- Confusing fielddata cache with query cache
- Thinking fielddata stores actual documents
- Assuming fielddata cache holds index metadata
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