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https://issues.apache.org/jira/browse/SCB-1742?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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humingcheng resolved SCB-1742.
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Resolution: Fixed
New mechanism： When Adaptor is not credible, no service discovery consistency
guarantee is made.
> Optimize Aggregator and etcd's service discovery cache mechanism
> ----------------------------------------------------------------
>
> Key: SCB-1742
> URL: https://issues.apache.org/jira/browse/SCB-1742
> Project: Apache ServiceComb
> Issue Type: Improvement
> Components: Service-Center
> Reporter: humingcheng
> Assignee: humingcheng
> Priority: Minor
> Time Spent: 20m
> Remaining Estimate: 0h
>
> Scenario:
> If the request revision is not empty and different from the revision of
> service-center's instance cache, service-center will call the backend
> directly to get instance data to response. Thus, the client can't get any
> instance data if service-center's backend is unavailable, even
> service-center's cache is available.
> Target:
> Optimize the second level cache of instance, in package server.service.cache.
> We only use the cache and not call the backend directly when using
> Aggregatory adaptor, as Aggregator does not guarantee accuracy when querying
> the backend.
> For other adaptors, if the backend is unavailable, the cache content is
> returned instead of a backend error.
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