Originally published at bitsar.net.
Twelve pods, one Redis, and @Cacheable(sync = true) on the method. I read that as a protected endpoint. It coordinates callers inside one JVM, so a cold key was still twelve calls to the same slow dependency. This is what I found when I went looking for the clustered version of that annotation, why I think it does not exist, and what it took to build one.
Source, benchmarks, the full parameter guide and nine open issues: github.com/BitanSarkar/coalesce-java.
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