[NFS] Stale NFS file handle error

[Tom H <tom-6kxvdouIZplzjhtm8Ag3mw@public.gmane.org>]

Hi,

I have been intermittently seeing a "Stale NFS file handle" error from a 
Java app we use to resize images and save them to a file on an NFS 
mounted directory.

An example of the code in Java is;

	File outputFile = new File(outputDir, (new 
StringBuilder()).append(filePrefix).append(ifile.getName()).toString());
	BufferedImage large = ImageIO.read(inputFile);
	BufferedImage scaled = scale(large, width, height);
	ImageIO.write(scaled, "jpg", outputFile);

And about once in every 10 thousand writes, it throws the following error;

java.io.IOException: Stale NFS file handle
	at java.io.RandomAccessFile.close(RandomAccessFile.java:573)
	at 
javax.imageio.stream.FileImageOutputStream.close(FileImageOutputStream.java:160)
	at javax.imageio.ImageIO.write(ImageIO.java:1519)
	at com.hz.pagemill.process.ImageScaler.scale(ImageScaler.java:47)

The NFS3 protocol specification defines a Stale File handle error as 
follows; (http://tools.ietf.org/html/rfc1813)

    NFS3ERR_STALE
        Invalid file handle. The file handle given in the
        arguments was invalid. The file referred to by that file
        handle no longer exists or access to it has been
        revoked.

The way the code works prevents 2 processes creating the same file, so I 
am pretty sure that whatever is moving, renaming or deleting the file is 
not part of the java app.

We are running the default nfs server with RHEL4;
[root@aspdb01 ~]# modinfo nfsd
filename:       /lib/modules/2.6.9-55.0.9.ELsmp/kernel/fs/nfsd/nfsd.ko
license:        GPL
author:         Olaf Kirch <okir-pn4DOG8n3UYbFoVRYvo4fw@public.gmane.org>
depends:        sunrpc,exportfs,lockd,nfs_acl
vermagic:       2.6.9-55.0.9.ELsmp SMP gcc-3.4

with the following export options;
[root@aspdb01 ~]# cat /etc/exports
/myshareZZZ     *(rw,sync,no_root_squash,no_subtree_check)

(I have tried it with, and without no_subtree_check)

I was hoping to get some pointers on debugging the issue.

Many Thanks,

Tom H




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