Title: This is the story of the latest and biggest issue that we have had with Redis. 3scale has a three layer fail-over on different data-centers (Amazon and Rackspace). Turns out that if your Redis write throughput is above 20 Mbps you better watch out or your master will silently crash due to an out of memory. Redis fault? Nope, a simple network I/O bottleneck that was quite a pain to track down. The solution? Compression. Clean, simple and it will save you some (hundreds) of bucks on your Amazon bill.
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