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https://issues.apache.org/jira/browse/PDFBOX-2301?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14138673#comment-14138673
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Timo Boehme commented on PDFBOX-2301:
-------------------------------------

IMHO we should use a random access object for filteredStream in COSStream which 
is directly set. This would allow to wrap the input file and provide it to the 
stream without copying the raw data. Additionally we need a RandomAccessBuffer 
solution for writing the decoded data. For this a combined memory/file solution 
would be good.

> RandomAccessBuffer consumes too much memory.
> --------------------------------------------
>
>                 Key: PDFBOX-2301
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-2301
>             Project: PDFBox
>          Issue Type: Bug
>          Components: PDModel
>    Affects Versions: 1.8.6, 2.0.0
>            Reporter: gee
>            Assignee: Andreas Lehmkühler
>             Fix For: 2.0.0
>
>         Attachments: clone.diff, clone2.diff, clone3.diff
>
>
> RandomAccessBuffer holds uncompressed image during operation because it is 
> what exactly pdfbox ExtractImages do.
> but holding uncompressed image instead of compressed one in memory consumes 
> too much memory, not excluding many PDF XObjects that can use filter to 
> compress itself. It would be good if pdfbox provides option that reverts to 
> COSObject state just before the RandomAccess object created(the state that 
> pdf XObject stream parsed and COSDictionary objects haven't created because 
> user doesn't requested it using get____() method.) It is crucial feature so 
> that pdfbox can analyze huge pdf file(>100MB).
> In current source, one must close COSStream unless required(and I know closed 
> stream cannot reopened again.)
> Class Name                                                                    
>                                                                               
>                                                                               
>                                                                          | 
> Shallow Heap | Retained Heap
> --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
> org.apache.pdfbox.cos.COSObject @ 0x5ad4940                                   
>                                                                               
>                                                                               
>                                                                          |    
>        24 |     8,187,264
> |- <class> class org.apache.pdfbox.cos.COSObject @ 0x58c4020                  
>                                                                               
>                                                                               
>                                                                          |    
>         0 |             0
> |- generationNumber org.apache.pdfbox.cos.COSInteger @ 0x5ad0080              
>                                                                               
>                                                                               
>                                                                          |    
>        24 |            24
> |- baseObject org.apache.pdfbox.cos.COSStream @ 0x5b25ea0                     
>                                                                               
>                                                                               
>                                                                          |    
>        32 |     8,187,216
> |  |- <class> class org.apache.pdfbox.cos.COSStream @ 0x58c3e00               
>                                                                               
>                                                                               
>                                                                          |    
>         8 |             8
> |  |- items java.util.LinkedHashMap @ 0x5b2a0f0                               
>                                                                               
>                                                                               
>                                                                          |    
>        56 |           552
> |  |- file org.apache.pdfbox.io.RandomAccessBuffer @ 0x5b2a128                
>                                                                               
>                                                                               
>                                                                          |    
>        48 |     8,186,528
> |  |  |- <class> class org.apache.pdfbox.io.RandomAccessBuffer @ 0x5ad2b00    
>                                                                               
>                                                                               
>                                                                          |    
>         8 |             8
> |  |  |- currentBuffer byte[16384] @ 0x590f360      16,400 |        16,400
> |  |  |- bufferList java.util.ArrayList @ 0x5b2e200                           
>                                                                               
>                                                                               
>                                                                          |    
>        24 |     8,170,080
> |  |  '- Total: 3 entries                                                     
>                                                                               
>                                                                               
>                                                                          |    
>           |              
> |  |- filteredStream org.apache.pdfbox.io.RandomAccessFileOutputStream @ 
> 0x5b2a158                                                                     
>                                                                               
>                                                                               
> |           32 |            32
> |  |- decodeResult org.apache.pdfbox.filter.DecodeResult @ 0xa65f618          
>                                                                               
>                                                                               
>                                                                          |    
>        16 |            16
> |  |- unFilteredStream org.apache.pdfbox.io.RandomAccessFileOutputStream @ 
> 0xa71ab18                                                                     
>                                                                               
>                                                                             | 
>           32 |            32
> |  '- Total: 6 entries                                                        
>                                                                               
>                                                                               
>                                                                          |    
>           |              
> |- objectNumber org.apache.pdfbox.cos.COSInteger @ 0x5b25ec0                  
>                                                                               
>                                                                               
>                                                                          |    
>        24 |            24
> --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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