MySQL Bugs: #28633: sometimes the correct graph interval is not being shown when changed by user

Bug #28633	sometimes the correct graph interval is not being shown when changed by user
Submitted:	23 May 2007 21:45	Modified:	12 Jun 2007 21:00
Reporter:	Andrew Cwik	Email Updates:
Status:	Closed	Impact on me:	None
Category:	MySQL Enterprise Monitor: Web	Severity:	S3 (Non-critical)
Version:	1.1.1.5646	OS:	Any
Assigned to:	Joshua Ganderson	CPU Architecture:	Any

Description:
Sometimes when changing the graph interval a different interval than the one selected gets displayed.  For instance, I would select an interval of four hours and the graph would display three and one half hours (i.e. 13:00 - 16:30).  Most of the time it seems to work correctly (i.e. 13:00 - 17:00).  I saw this on both windows and Linux.

How to repeat:
Go to the monitor tab and click on one of the graphs to bring up a larger version of the graph.  Click on the configure tab and change the time interval and select update.  Sometimes the wrong interval will be displayed.

graph interval was set to 4 hours, but 3 1/2 displayed

Attachment: 28633.png (image/png, text), 5.04 KiB.

dashboard

Attachment: MySQL Network Enterprise Dashboard _ Monitor.htm (text/html), 95.74 KiB.

According to Oldag, this has been seen before and we did some scaling to attempt to mitigate the problem. Apparently it has something to do with the rendering internals of jfree chart.

If this happens again, change the size of the graphs and see if the issue goes away. We may need to adjust the default width and document boundary cases in rendering. If it doesn't go away, reassign to Oldag to look over the rendering code for a problem.

known issue with jfree chart