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https://issues.apache.org/jira/browse/ACCUMULO-2615?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bill Havanki reassigned ACCUMULO-2615:
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Assignee: Bill Havanki
> Simplify server configuration caching and ZK watchers
> -----------------------------------------------------
>
> Key: ACCUMULO-2615
> URL: https://issues.apache.org/jira/browse/ACCUMULO-2615
> Project: Accumulo
> Issue Type: Improvement
> Reporter: Bill Havanki
> Assignee: Bill Havanki
> Fix For: 1.6.1
>
>
> The mechanism used for caching server-related configuration objects and
> processing ZK events could do with some simplification. For example:
> * {{NamespaceConfWatcher}} and {{TableConfWatcher}} objects guess at what
> they are supposed to be watching by looking for namespace/table IDs in ZK
> events; they do not save the IDs they pertain to.
> * The watcher objects obtain their corresponding configuration objects by
> reaching through the {{ServerConfiguration}} cache, instead of just having a
> reference field.
> * The watcher objects set log4j logging levels for both ZK and
> o.a.hadoop.io.compress to WARN, which prohibits debugging when needed. That
> should be done in log4j properties/XML instead.
> * Possible bug: {{NamespaceConfWatcher}} expires table configuration
> observers, not namespace configuration observers.
> * There is high duplication between the static and instance methods of
> {{ServerConfiguration}}. The class serves as both a cache container and a
> factory. Moreover, despite its name, it isn't actually a configuration object.
> I may be missing some subtleties of why things are as they are, so please
> fill me in as needed.
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