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From "Paolo Castagna (JIRA)" <>
Subject [jira] [Commented] (JENA-91) extremely large buffer is being created in ObjectFileStorage
Date Mon, 22 Aug 2011 10:41:29 GMT


Paolo Castagna commented on JENA-91:

Simon, thanks. I was not able to apply the patch from your file but I copied the changes manually.
I did not see problems while running the test normally, but once I added a couple of break
points and I run it in debug mode, I managed to see: "Different ids allocated: expected [000000000000004F],
got [0000000000000058]".
I still do not know where the bug is but I am trying to see if I can extract a sequential
test which exposes it.

> extremely large buffer is being created in ObjectFileStorage
> ------------------------------------------------------------
>                 Key: JENA-91
>                 URL:
>             Project: Jena
>          Issue Type: Bug
>          Components: TDB
>            Reporter: Simon Helsen
>            Assignee: Andy Seaborne
>            Priority: Critical
>         Attachments: TestTransSystem.patch, TestTransSystem2.patch
> I tried to debug the OME and check why a bytebuffer is causing my native memory to explode
in almost no time. It all seems to happen in this bit of code in com.hp.hpl.jena.tdb.base.objectfile.ObjectFileStorage
(lines 243 onwards)
>   // No - it's in the underlying file storage.
>         lengthBuffer.clear() ;
>         int x =, loc) ;
>         if ( x != 4 )
>             throw new FileException(""+loc+")["+filesize+"]["+file.size()+"]:
Failed to read the length : got "+x+" bytes") ;
>         int len = lengthBuffer.getInt(0) ;
>         ByteBuffer bb = ByteBuffer.allocate(len) ;
> My debugger shows that x==4. It also shows the lengthBuffer has the following content:
[111, 110, 61, 95]. This amounts to the value of len=1869495647, which is rather a lot :-)
Obviously, the next statement (ByteBuffer.allocate) causes the OME.

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