Question 121114 in Redis Question posted in
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When a key is evicted from Redis, is it possible to know which keys are evicted?

Lets say a Redis node is configured with an eviction policy of LRU. Whenever an key-eviction takes place, is there way to know which keys are evicted?

Using this information, I would like to build a system where evicted keys are streamed to another database.

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2

Answers


  1. 0

    Did you take a look at Redis keyspace notifications. https://redis.io/docs/manual/keyspace-notifications/

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  2. 0

    With the RedisGears module you can react to these keyspace notifications.

    In RedisGears 2 you can register your consumer, and then push information from there to the stream. But this is happening after the eviction has happened.

    //Second argument is to set a prefix for keys you want to filter on
redis.register_notifications_consumer("eviction_consumer", "", function(client, data) {
    //Do checks here
    
    client.call('XADD', data.key, ...);
});

    There is an extensive get started in the RedisGears repository.

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