[FOP-2561] Multithreaded FOP conserve memory failure

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.0
• Assignee: Unassigned
• Reporter: Maciej Zerkowski
• Created: 07/Jan/16 14:38
• Updated: 17/Mar/17 10:08

Description

Hi Guys,

I'm dealing with really large data so using conserve memory flag as below

foUserAgent.setConserveMemoryPolicy(true);

But it seems that in multithreaded mode all of the threads use the same default location set by the resolver:

CachedRenderPagesModel.class:  tempBaseURI = TEMP_URI_GENERATOR.generate();

So I can see in the logs:
...
Delegating to default resolver for uri: tmp:/fop-page-873.ser
...

But in multithreaded configuration I'm getting the below exception:

13:59:53.334 [task-scheduler-4] ERROR org.apache.fop.apps.FOUserAgent- Error while serializing page 4. Reason: java.io.IOException: /tmp/fop-page-3.ser2704106194054979958.fop.tmp has been already created for /fop-page-3.ser
java.io.IOException: /tmp/fop-page-3.ser2704106194054979958.fop.tmp has been already created for /fop-page-3.ser
	at org.apache.fop.apps.io.ResourceResolverFactory$DefaultTempResourceResolver.createTempFile(ResourceResolverFactory.java:187) ~[fop-2.0.jar!/:na]
	at org.apache.fop.apps.io.ResourceResolverFactory$DefaultTempResourceResolver.getOutputStream(ResourceResolverFactory.java:199) ~[fop-2.0.jar!/:na]
	at org.apache.fop.apps.io.ResourceResolverFactory$TempAwareResourceResolver.getOutputStream(ResourceResolverFactory.java:159) ~[fop-2.0.jar!/:na]
	at org.apache.fop.apps.io.ResourceResolverFactory$DefaultResourceResolver.getOutputStream(ResourceResolverFactory.java:126) ~[fop-2.0.jar!/:na]
	at com.xxxxxxx.fop.XXXXXX.getOutputStream(XXXXXX.java:87) ~[xxx.jar!/:na]
	at org.apache.fop.apps.io.InternalResourceResolver.getOutputStream(InternalResourceResolver.java:103) ~[fop-2.0.jar!/:na]
	at org.apache.fop.area.CachedRenderPagesModel.savePage(CachedRenderPagesModel.java:128) [fop-2.0.jar!/:na]
	at org.apache.fop.area.CachedRenderPagesModel.checkPreparedPages(CachedRenderPagesModel.java:110) [fop-2.0.jar!/:na]
	at org.apache.fop.area.RenderPagesModel.addPage(RenderPagesModel.java:146) [fop-2.0.jar!/:na]

Can you please advise if there is a way to maybe configure it for multithreaded mode - maybe I'm missing something? How to make this tmp files unique...
Or it is rather a bug?