DEV: add info about new eviction policies (allkeys-lrm & volatile-lrm) #2638
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Contributor
Contributor
LiorKogan
reviewed
Jan 14, 2026
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| ## LRM eviction {#lrm-eviction} | ||
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| Starting with Redis 8.6, the Least Recently Modified (LRM) eviction mode is available. LRM is similar to LRU but only updates the timestamp on write operations, not read operations. This makes it useful for evicting keys that haven't been modified recently, regardless of how frequently they are read. |
LiorKogan
reviewed
Jan 14, 2026
| - Your application has a clear distinction between read-heavy and write-heavy workloads | ||
| - You want to evict stale data that hasn't been updated, regardless of read activity | ||
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| To configure the LRM mode, the following policies are available: |
LiorKogan
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Jan 14, 2026
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| This distinction makes LRM particularly useful in scenarios where: | ||
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| - You want to preserve frequently read data, even if it's not being modified |
LiorKogan
reviewed
Jan 14, 2026
| - `allkeys-random`: Evict keys at random. | ||
| - `volatile-lru`: Evict the least recently used keys that have the `expire` field | ||
| set to `true`. | ||
| - `volatile-lrm`: Evict the least recently modified keys that have the `expire` field |
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Please fix the 4 volatile policies:
instead of "that have the expire field set to true" ---> "that has an associated expiration (TTL)"
I'm not aware of any such field (and if there is - it is an internal implementation details)
LiorKogan
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Jan 14, 2026
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| To configure the LRM mode, the following policies are available: | ||
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| * `volatile-lrm` Evict using LRM among the keys with an expire set. |
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expire set --> associated expiration (TTL)
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