February 2018
Intermediate to advanced
382 pages
11h 33m
English
Content preview from Redis 4.x Cookbook
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HLL is actually stored as string, and it's easy to persist and restore for key-value pairs.
For your reference, HLL in Redis uses two presentations internally to store HLL objects:
- Sparse: For an HLL object whose length is less than hll-sparse-max-bytes (default: 3000) in configuration. Sparse representation is more space efficient, while it may cost more CPU in Redis.
- Dense: The default encoding when sparse encoding cannot be used per configuration.
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