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From "Ann Robinson (JIRA)" <j...@apache.org>
Subject [jira] Updated: (AXIS2-2968) Out-Of-Memory error on server side - Use of wsdl4j WSDLDefinition
Date Fri, 14 Sep 2007 16:05:32 GMT

     [ https://issues.apache.org/jira/browse/AXIS2-2968?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ann Robinson updated AXIS2-2968:
--------------------------------

    Attachment: patch_02_part1.txt

The attached patch, patch_02_part1.txt, contains the initial implementation of the light-weight
wsdl definition wrapper and changes to various components to use the wrapper in cases where
the WSDL4J wsdl definition is saved as a parameter on the AxisService object instance.

This initial implementation is intended to be used on the current Axis2 so it does not require
any updates to the WSDL4J.  In this case, the wsdl definition wrapper delegates the wsdl definition
interface to the WSDL4J implementation.

What this gives us is a way to migrate to a new version of WSDL4J when the WSDL4J becomes
available
- in a more transparent fashion to users of the wsdl definition
- only the wrapper needs to be updated to do the memory reduction steps in those environments
that need it


> Out-Of-Memory error on server side - Use of wsdl4j WSDLDefinition
> -----------------------------------------------------------------
>
>                 Key: AXIS2-2968
>                 URL: https://issues.apache.org/jira/browse/AXIS2-2968
>             Project: Axis 2.0 (Axis2)
>          Issue Type: Bug
>          Components: kernel
>            Reporter: Ann Robinson
>            Assignee: Ann Robinson
>            Priority: Critical
>         Attachments: patch_01.txt, patch_02_part1.txt
>
>
> In some server-side environments, there is an out-of-memory problem when      
> attempting to handle a large number of JAXWS-based web service applications.  
>                                                                               
> In the test scenario that fails, the server is attempting to load and start   
> 100 web service applications. A variety of heap sizes was tried to see if     
> a heap size for the server could be found to work, ranging from 1 GB to 4 GB. 
> Increasing the heap size did not work - the out-of-memory error continued to  
> occur.                                                                        
> In analyzing the java heap dumps, one of the biggest consumers of the memory  
> is with the wsdl4j WSDLDefinition objects.  In the test scenario, the         
> wsdl4j-related objects consumed about a quarter to a third of the entire heap.
>                                                                               
> The WSDLDefinition object is a very heavy-weight object, much of which stems  
> from its use of the xerces dom objects as underlying support, particularly    
> for the schemas.                                                              
>                                                                               
> One area to investigate is the saving of the WSDLDefinition as a Parameter    
> in the AxisService's ParameterInclude list so that, if some component needs   
> to utilize the WSDLDefinition object, it can be accessed via the AxisService  
> object.                                                                       
>                                                                               
> Is it possible to reduce the utilization of the WSDLDefinition?               
> Some ideas are:                                                               
> (a) releasing it when it is no longer needed                                  
>          - this might not be possible to determine                            
>                                                                               
> (b) putting a wrapper on the WSDLDefinition                                   
>          - so that the WSDLDefinition,or a portion of the WSDLDefinition,     
>            can be released                                                    
>          - but if the WSDLDefinition is accessed after it was released,       
>            the wrapper can reload the WSDLDefinition transparently to the     
>            user                                                               
>                                                                               
> (c) create a layer for caching wsdl-related information                       
>          - this would allow for releasing memory based on some algorithm      
>            and/or interface that could indicate what's no longer needed       
>                                                                               

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