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https://issues.apache.org/jira/browse/JCR-2396?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12868123#action_12868123
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Thomas Mueller commented on JCR-2396:
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> Was this patch applied to the 2.x line?
No, the path was never applied in the trunk. The reason is: it turned out the
patch didn't completely solve the problem for the given NFS implementation. As
far as I remember, the only solution would have been to wait 2 seconds or more
when reading zeroes. While it might be possible to build a patch that also
solves the remaining issues, I think that would be the wrong solution in the
long run. The code would get really complicated and hard to maintain. Also,
performance would be really bad (if the file system is not reliable). I think
it's better if we say the shared file system needs to be reliable.
I think the long term solution should be: don't rely on a shared file system
except for very simple operations. I guess a shared file system is not
problematic for the file data store and to bootstrap clustering (one properties
file per cluster node that contains the IP address and port).
> File Journal workaround for misbehaving NFS implementations
> -----------------------------------------------------------
>
> Key: JCR-2396
> URL: https://issues.apache.org/jira/browse/JCR-2396
> Project: Jackrabbit Content Repository
> Issue Type: Improvement
> Components: clustering
> Affects Versions: core 1.4.10
> Environment: Some versions of NFS
> Reporter: Thomas Mueller
> Assignee: Thomas Mueller
> Priority: Minor
> Attachments: diff.patch
>
>
> After one NFS client wrote data to a file, reading from another client
> results in blocks of zero
> in some NFS implementations. This is a known issue:
> http://markmail.org/search/blocks+of+zeros+%28NULLs%29+in+NFS+files+in+kernels
> The Jackrabbit file journal implementation does not work properly in this
> situation.
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