I have multiple threads using a service which is annotated with @Cacheable(cacheNames = "myName", sync = true, keyGenerator = "myGenerator"). My understanding is the sync = true should cause the other threads to use the cached value from the first thread as long as the keyGenerator is the same value. My issue is both threads which call the service execute the service instead of one of them using the cached value even though the keyGenerator is the same. The docs say sync = true will only work if it is supported by the caching provider. I am using redis. I can't find any information on whether redis supports it. Does anyone know if redis supports sync = true?

I have multiple threads using a service which is annotated with @Cacheable(cacheNames = "myName", sync = true, keyGenerator = "myGenerator"). My understanding is the sync = true should cause the other threads to use the cached value from the first thread as long as the keyGenerator is the same value. My issue is both threads which call the service execute the service instead of one of them using the cached value even though the keyGenerator is the same. The docs say sync = true will only work if it is supported by the caching provider. I am using redis. I can't find any information on whether redis supports it. Does anyone know if redis supports sync = true?

• spring-boot
• redis

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The sync flag is only considered for a single local cache. As per Javadoc, the sync flag is a hint for the cache provider that may or may not synchronize.
Please check this thread:
https://github/spring-projects/spring-data-redis/issues/1670?utm_source=chatgpt

Documentation:
This is an optional feature, and your favorite cache library may not support it. All CacheManager implementations provided by the core framework support it. See the documentation of your cache provider for more details.
https://docs.spring.io/spring-framework/reference/integration/cache/annotations.html