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From "Nick Burch (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (TIKA-818) Allow PDFBox to be used with RandomAccessFile vs RandomAccessBuffer to allow for a memory vs performance tradeoff
Date Mon, 23 Jan 2012 10:00:53 GMT

    [ https://issues.apache.org/jira/browse/TIKA-818?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13190965#comment-13190965
] 

Nick Burch commented on TIKA-818:
---------------------------------

Tika does already handle its own temporary files, via org.apache.tika.io.TemporaryResources,
it should be fairly straightforward to use that for the temporary files for your case too

In terms of picking, I'd potentially suggest that if the TikaInputStream has a file then use
file based resources, but if it's stream based only then continue with the current behaviour
                
> Allow PDFBox to be used with RandomAccessFile vs RandomAccessBuffer to allow for a memory
vs performance tradeoff
> -----------------------------------------------------------------------------------------------------------------
>
>                 Key: TIKA-818
>                 URL: https://issues.apache.org/jira/browse/TIKA-818
>             Project: Tika
>          Issue Type: Improvement
>          Components: parser
>    Affects Versions: 0.10, 1.0
>            Reporter: Paul Pearcy
>   Original Estimate: 24h
>  Remaining Estimate: 24h
>
> After upgrading to Tika 0.10, began having OOM errors processing large amounts of PDFs
in parallel. The heap dump indicated that all the memory was getting used up by PDFBox RandomAccessBuffers.
After digging around, it looks like PDFBox now defaults to using RAM vs temporary files for
PDF extraction. This can be overridden to use RandomAccessFiless. 
> I propose that Tika controls file vs buffer based on the inputstream type received. If
the TikaInputStream is a file, RandomAccessFile should be used and for other stream types,
RandomAccessBuffer can be used. 
> I believe the code to control this is here:
> https://github.com/apache/tika/blob/trunk/tika-parsers/src/main/java/org/apache/tika/parser/pdf/PDFParser.java
> At ~line 87:
> PDDocument pdfDocument =
>             PDDocument.load(new CloseShieldInputStream(stream), true);
> Not sure if this is the best approach and am curious if there are other ideas on how
to control this and keep the interface clean. 

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