JIRA: https://jira.spring.io/browse/INT-3604 There is no test-case to cover the issue, because it isn't so easy to emulate the network glitch between `setIfAbsent` and `expire`
JIRA: https://jira.spring.io/browse/INT-3604 There is no test-case to cover the issue, because it isn't so easy to emulate the network glitch between `setIfAbsent` and `expire`