[jira] [Created] (ATLAS-683) Refactor local type-system cache with cache provider interface

["venkata madugundu (JIRA)" <ji...@apache.org>]

venkata madugundu created ATLAS-683:
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             Summary: Refactor local type-system cache with cache provider interface
                 Key: ATLAS-683
                 URL: https://issues.apache.org/jira/browse/ATLAS-683
             Project: Atlas
          Issue Type: Sub-task
    Affects Versions: 0.7-incubating
            Reporter: venkata madugundu
            Priority: Critical
             Fix For: 0.7-incubating


As noted in ATLAS-488, local type-system cache makes Atlas runtime stateful and prevents multiple Atlas instances to be active in a cluster. Either the type-cache should be synched across Atlas instances (on all type create/update requests) or the type-cache should be moved out of Atlas to something like a distributed cache. 

1. As a first step, the local type-cache code in TypeSystem.java can be refactored to be carved out as an interface like TypeCacheProvider (whose default implementation for a standalone Atlas server would just use in-process local cache). The cache provider implementation itself could be specified as an optional configuration property. Expert users of Atlas can choose to inject a custom cache provider which can likely hit a distributed cache. We are evaluating the use of a distributed cache. 

2. As a second step, some more refactoring can be done to minimize/optimize the calls made to TypeSystem for type lookup queries. Essentially, in a given transaction/request, once a type lookup is done, it should not be requeried again. A request scoped variable (guice would probably help with that scoping) can hold all the lookups made in a request. This might sound like a cache of a cache, but I think it should help in reducing the hits to cache provider if the provider is hitting a remote cache.



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