cacheDuration impact of setting this to 100ms
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调研方向
首先阅读此处描述的 context.cacheDuration 行为以及相关的 cf-java-client issue 749，然后跟踪 UAA 访问令牌刷新期间如何处理缓存的 404 响应和连接超时。完成的标准是：达成一致的缓存或重试设计，防止瞬态错误被无限期缓存，并确定其对 100 ms 和 1 ms 时长的影响。
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描述
We recently experienced issues with the cf-java-client where the cache duration was set to indefinite by default as detailed in the issue https://github.com/cloudfoundry/cf-java-client/issues/749. However, this happened in an able that had otherwise been stable but had to refresh its access token. Upon attempting to refresh the application received a connection timeout or a sporadic 404 from the uaa server (likely during a repave of the foundation or for some unknown reason). This resulted in some requests from the same application caching the 404 or the connection timeout which rendered some operations inoperable. We have debated setting the context.cacheDuration equal to 100 ms or 1 ms to avoid this possibility but was concerned with what the potential impact this would have? We also would like to lobby for a completely different approach to be taken for caching these stable payloads such as adding exception handling that will retry in the case of IOexceptions instead of caching the error condition indefinitely.
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