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Posted to dev@jackrabbit.apache.org by "Thomas Mueller (JIRA)" <ji...@apache.org> on 2009/11/17 10:28:39 UTC
[jira] Created: (JCR-2396) File Journal workaround for misbehaving
NFS implementations
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
Environment: Some versions of NFS
Reporter: 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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[jira] Updated: (JCR-2396) File Journal workaround for misbehaving
NFS implementations
Posted by "Thomas Mueller (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/JCR-2396?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Thomas Mueller updated JCR-2396:
--------------------------------
Affects Version/s: core 1.4.10
> 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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[jira] Updated: (JCR-2396) File Journal workaround for misbehaving
NFS implementations
Posted by "Thomas Mueller (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/JCR-2396?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Thomas Mueller updated JCR-2396:
--------------------------------
Attachment: diff.patch
This patch used FileChannel.lock(..) as a workaround.
> 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
> 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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[jira] Commented: (JCR-2396) File Journal workaround for
misbehaving NFS implementations
Posted by "Thomas Mueller (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/JCR-2396?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12868123#action_12868123 ]
Thomas Mueller commented on JCR-2396:
-------------------------------------
> 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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[jira] Assigned: (JCR-2396) File Journal workaround for misbehaving
NFS implementations
Posted by "Thomas Mueller (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/JCR-2396?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Thomas Mueller reassigned JCR-2396:
-----------------------------------
Assignee: Thomas Mueller
> 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
> 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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[jira] Updated: (JCR-2396) File Journal workaround for misbehaving
NFS implementations
Posted by "Thomas Mueller (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/JCR-2396?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Thomas Mueller updated JCR-2396:
--------------------------------
Status: Patch Available (was: Open)
I don't plan to commit the patch currently, because it is only a partial solution.
The only real solution is to use a correct NFS implementation.
> 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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[jira] Commented: (JCR-2396) File Journal workaround for
misbehaving NFS implementations
Posted by "Jeff Yemin (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/JCR-2396?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12866004#action_12866004 ]
Jeff Yemin commented on JCR-2396:
---------------------------------
Was this patch applied to the 2.x line?
> 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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[jira] Issue Comment Edited: (JCR-2396) File Journal workaround for
misbehaving NFS implementations
Posted by "Thomas Mueller (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/JCR-2396?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12778787#action_12778787 ]
Thomas Mueller edited comment on JCR-2396 at 11/17/09 9:28 AM:
---------------------------------------------------------------
This patch used FileChannel.lock(..) as a workaround.
The patch is against Jackrabbit 1.4.10.
was (Author: tmueller):
This patch used FileChannel.lock(..) as a workaround.
> 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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[jira] Updated: (JCR-2396) File Journal workaround for misbehaving
NFS implementations
Posted by "Thomas Mueller (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/JCR-2396?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Thomas Mueller updated JCR-2396:
--------------------------------
Resolution: Won't Fix
Status: Resolved (was: Patch Available)
> 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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