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From "Thomas Mueller (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (OAK-201) NamespaceRegistry is very slow
Date Mon, 23 Jul 2012 12:19:33 GMT

    [ https://issues.apache.org/jira/browse/OAK-201?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13420597#comment-13420597
] 

Thomas Mueller commented on OAK-201:
------------------------------------

A stack trace:

SessionImpl.refresh(boolean) line: 156	
WorkspaceImpl$1.refresh() line: 153	
WorkspaceImpl$1(NamespaceRegistryImpl).getURI(String) line: 162	
SessionImpl(AbstractSession).getNamespaceURI(String) line: 132	
SessionDelegate$SessionNameMapper.getOakPrefix(String) line: 453	
SessionDelegate$SessionNameMapper(AbstractNameMapper).getOakName(String) line: 61	
NamePathMapperImpl.getOakName(String) line: 46	
NodeTypeManagerImpl.getNodeType(String) line: 83	
NodeImpl.addNode(String, String) line: 217	

So for each addNode(String, String), currently there is a Session.refresh(true).
                
> 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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