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From "Tim Allison (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (TIKA-2802) Out of memory issues when extracting large files (pst)
Date Thu, 03 Jan 2019 18:30:00 GMT

    [ https://issues.apache.org/jira/browse/TIKA-2802?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16733340#comment-16733340
] 

Tim Allison commented on TIKA-2802:
-----------------------------------

I don't know how generalizable this is, but it looks like this is holding a large xlsx sheet
in memory....{{<worksheet...}}.  That part _might_ be a problem with xerces.  

I notice with xerces2 (at least), that the XMLReader held by the SAXParser is not released/cleared
when we call {{reset()}} on the SAXParser.  If we add some nullifications to our reset (as
below), that clears out the reader:

{noformat}
                XMLReader reader = saxParser.getXMLReader();
                reader.setContentHandler(null);
                reader.setDTDHandler(null);
                reader.setEntityResolver(null);
                reader.setErrorHandler(null);
{noformat}

Let me try some things with xerces, and I'll let you know what I find.

> Out of memory issues when extracting large files (pst)
> ------------------------------------------------------
>
>                 Key: TIKA-2802
>                 URL: https://issues.apache.org/jira/browse/TIKA-2802
>             Project: Tika
>          Issue Type: Bug
>          Components: parser
>    Affects Versions: 1.20, 1.19.1
>         Environment: Reproduced on Windows 2012 R2 and Ubuntu 18.04.
> Java: jdk1.8.0_151
>  
>            Reporter: Caleb Ott
>            Priority: Critical
>         Attachments: Selection_111.png
>
>
> I have an application that extracts text from multiple files on a file share. I've been
running into issues with the application running out of memory (~26g dedicated to the heap).
> I found in the heap dumps there is a "fDTDDecl" buffer which is creating very large char
arrays and never releasing that memory. In the picture you can see the heap dump with 4 SAXParsers
holding onto a large chunk of memory. The fourth one is expanded to show it is all being held
by the "fDTDDecl" field. This dump is from a scaled down execution (not a 26g heap).
> It looks like that DTD field should never be that large, I'm wondering if this is a bug
with xerces instead? I can easily reproduce the issue by attempting to extract text from large
.pst files.



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