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From "Tricia Williams (Commented) (JIRA)" <>
Subject [jira] [Commented] (SOLR-2886) Out of Memory Error with DIH and TikaEntityProcessor
Date Fri, 25 Nov 2011 16:59:40 GMT


Tricia Williams commented on SOLR-2886:

Some further bug tracing shows that pdfbox' RandomAccessBuffer is responsible for the Out
of Memory error.  It creates a new larger buffer and then copies the existing buffer into
the new buffer.  There are no checks to see if the space is available to create a new larger
buffer.  Use of a RandomAccessBuffer was introduced with PDFBOX-948 at revision 1072678 on
Feb 20, 2011 and in the pdfbox 1.5 and 1.6 releases, hence tika 0.10 in revision 1080162 on
Mar 10, 2011 and revision 1171497 on Sep 16, 2011.  Moving my DIH workflow to another machine
with more memory available is able to run to completion.  

It appears that I am the victim of the caviate stated in PDFBOX-948:

For normal sized PDFs files, the in-memory implementation RandomAccessBuffer should not increase
the memory usage too much, while providing faster IO as all access operations are only memory
Therefore, please consider switching the default to in-memory scratch buffers. Users with
very large files can still pass a temporary directory. 

Now to track down how to detect "large files" and use a temporary directory instead.  This
may turn out to be a TIKA issue rather than Solr.
> Out of Memory Error with DIH and TikaEntityProcessor
> ----------------------------------------------------
>                 Key: SOLR-2886
>                 URL:
>             Project: Solr
>          Issue Type: Bug
>          Components: contrib - DataImportHandler, contrib - Solr Cell (Tika extraction)
>    Affects Versions: 4.0
>            Reporter: Tricia Williams
>             Fix For: 4.0
> I've recently upgraded from apache-solr-4.0-2011-06-14_08-33-23.war to apache-solr-4.0-2011-10-14_08-56-59.war
and then apache-solr-4.0-2011-10-30_09-00-00.war to index ~5300 pdfs, of various sizes, using
the TikaEntityProcessor.  My indexing would run to completion and was completely successful
under the June build.  The only error was readability of the fulltext in highlighting.  This
was fixed in Tika 0.10 (TIKA-611).  I chose to use the October 14 build of Solr because Tika
0.10 had recently been included (SOLR-2372).  
> On the same machine without changing any memory settings my initial problem is a Perm
Gen error.  Fine, I increase the PermGen space.
> I've set the "onError" parameter to "skip" for the TikaEntityProcessor.  Now I get several
> SEVERE: Exception thrown while getting data
> Read timed out
> SEVERE: Exception in entity : tika:org.apache.solr.handler.dataimport.DataImport
> HandlerException: Exception in invoking url <url removed> # 2975
> pairs.  And after ~3881 documents, with auto commit set unreasonably frequently I consistently
get an Out of Memory Error 
> SEVERE: Exception while processing: f document : null:org.apache.solr.handler.dataimport.DataImportHandlerException:
java.lang.OutOfMemoryError: Java heap space
> The stack trace points to
and org.apache.solr.handler.dataimport.DocBuilder.buildDocument(
> The October 30 build performs identically.
> Funny thing is that monitoring via JConsole doesn't reveal any memory issues.
> Because the out of Memory error did not occur in June, this leads me to believe that
a bug has been introduced to the code since then.

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