Redis 4.x Cookbook

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While Redis keeps appending write commands to the AOF file, the file size may grow significantly. This will slow the replay process when Redis is starting. Redis provides a mechanism to compress the AOF file with an AOF rewrite. As you might have guessed, some of the Redis keys had been deleted or expired, so they can be cleaned up in the AOF file. The values for certain Redis keys were updated multiple times and only the latest value needs to be stored in the AOF file. This is the basic idea of data compaction in an AOF rewrite. We can use the BGREWRITEAOF command to initiate the rewrite process, or let Redis perform an AOF rewrite automatically. We will discuss AOF rewrites in the following recipe.

The AOF file could be ...