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From "venkata madugundu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ATLAS-683) Refactor local type-system cache with cache provider interface
Date Wed, 27 Apr 2016 17:04:12 GMT

    [ https://issues.apache.org/jira/browse/ATLAS-683?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15260489#comment-15260489
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venkata madugundu commented on ATLAS-683:
-----------------------------------------

Thanks very much Erik for the instructions.

> 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
>            Assignee: venkata madugundu
>            Priority: Critical
>              Labels: high-availability, performance, scalability
>             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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