[jira] [Commented] (OAK-201) NamespaceRegistry is very slow

["Jukka Zitting (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/OAK-201?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13420546#comment-13420546 ] 

Jukka Zitting commented on OAK-201:
-----------------------------------

Before trying to optimize the NamespaceRegistryImpl, I'd prefer to get rid of the {{getURI}} and {{getPrefix}} calls in the first place. The name mapper could avoid all namespace lookups as long as no session-local namespace remappings are in effect.
                
> NamespaceRegistry is very slow
> ------------------------------
>
>                 Key: OAK-201
>                 URL: https://issues.apache.org/jira/browse/OAK-201
>             Project: Jackrabbit Oak
>          Issue Type: Bug
>            Reporter: Thomas Mueller
>
> The NamespaceRegistryImpl.getURI and getPrefix are called a lot, for example by NamePathMapperImpl.getOakName. 
> The method doesn't do any caching, which is a problem because it has to read it each time from the repository. Even if it would do caching, it wouldn't help because it the method WorkspaceImpl.getNamespaceRegistry creates a new NamespaceRegistryImpl each time it is called. To allow caching of known mappings, the instance needs to be cached as well.

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