[#MDL-19328] Occasional Partial Content Delivery - Page stops half way through loading - Abrupt cutoff in HTML code

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Key:	MDL-19328
Type:	Bug
Status:	Open
Priority:	Major
Assignee:	Tim Hunt
Reporter:	Greg Johnston
Votes:	0
Watchers:	0

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Moodle

Occasional Partial Content Delivery - Page stops half way through loading - Abrupt cutoff in HTML code

Created: 29/May/09 05:14 AM Updated: 20/Jun/09 01:32 AM

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Component/s:

Quiz, SCORM, Unknown

Affects Version/s:

1.9.2

Fix Version/s:

None

Environment:

Windows 2003 Server running IIS, MySQL 5.0.45 and PHP 5.2.5. Internet Explorer 7 is used on the client side in most cases.

Database:	MySQL
URL:	N/A
Participants:	Greg Johnston and Tim Hunt
Security Level:	None
Affected Branches:	MOODLE_19_STABLE

Description

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We have an occasional problem where all of the HTML content does not get delivered, the page is rendered incompletely. The most recent instance was during a 50 question quiz, one student's page stopped at 41. When viewing source the page just stopped in the middle of the HTLM.

All of the other times we've seen this issue it's been with SCORM content where file.php seemed not to deliver the entire page. Again with viewing source it just stops abruptly in the middle of an HTML tag.

It's hard to track or pin down as most of the time it works fine. I've view over 100 pages without any issue and others have not been so lucky.

We thought we had solved this with upgrading from 1.8.6 to 1.9.2, but it has been brought to our attention again.

This is my first post and I couldn't find anything like this when searching the Moodle tracker. I'm stumped any assistance would be appreciated.

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Greg Johnston made changes - 29/May/09 05:19 AM

Field	Original Value	New Value
Description	We have an occasional problem where all of the HTML content does not get delivered, the page is rendered incompletely. The most recent instance was during a 50 question quiz, one student's page stopped at 41. When viewing source the page just stopped in the middle of the HTLM. All of the other times we've seen this issue it's been with SCORM content where file.php seemed not to deliver the entire page. Again with viewing source it just stops abruptly in the middle of an HTML tag. It's hard to track or pin down as most of the time it works fine. I've view over 100 pages without any issue and others have not been so lucky. We thought this had solved this with upgrading from 1.8.6 to 1.9.2, but it's been brought to our attention again. This is my first post and I couldn't find anything like this when searching the Moodle tracker. I'm stumped any assistance would be appreciated.	We have an occasional problem where all of the HTML content does not get delivered, the page is rendered incompletely. The most recent instance was during a 50 question quiz, one student's page stopped at 41. When viewing source the page just stopped in the middle of the HTLM. All of the other times we've seen this issue it's been with SCORM content where file.php seemed not to deliver the entire page. Again with viewing source it just stops abruptly in the middle of an HTML tag. It's hard to track or pin down as most of the time it works fine. I've view over 100 pages without any issue and others have not been so lucky. We thought we had solved this with upgrading from 1.8.6 to 1.9.2, but it has been brought to our attention again. This is my first post and I couldn't find anything like this when searching the Moodle tracker. I'm stumped any assistance would be appreciated.

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Tim Hunt added a comment - 05/Jun/09 03:45 PM

This is probably PHP hitting one of its limits, either memory, or more likely execution time. See, for example http://au2.php.net/manual/en/info.configuration.php#ini.max-execution-time.

If you turn on debugging (http://docs.moodle.org/en/Debugging), you should see an error message at the point where the page it truncated.

So this is not really a Moodle bug, as such. More a bad interaction between how you are using Moodle, and your server configuration. (For example, 50 question quiz, all questions on one page, is not really recommended.)

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Greg Johnston added a comment - 20/Jun/09 01:32 AM

I can see how this might be a PHP issue and thank you for the link and comment. We've changed a couple of settings and will have to wait and see if that fixes the issue.

Debugging is not a good option for us as we cannot trigger the problem. It has only happened to me a couple of times over months of casual use. Unfortunately it also happens to our students too.

The quiz was only one example, the others have occurred with SCORM pages which deliver rich media. I can't see why having 50 questions on a single page would not be recommended. It seems like a simple enough thing to handle.

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