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Posted to common-dev@hadoop.apache.org by "Owen O'Malley (JIRA)" <ji...@apache.org> on 2006/09/12 07:30:23 UTC
[jira] Updated: (HADOOP-243) WI shows progress as 100.00% before
actual completion (rounding error)
[ http://issues.apache.org/jira/browse/HADOOP-243?page=all ]
Owen O'Malley updated HADOOP-243:
---------------------------------
Attachment: percent-complete.patch
This patch creates a new method in StringUtils for formating percentages and uses it in all of the progress fields in the web/ui. The method displays the percentage as "0.00%" with values rounded down.
To ensure that complete jobs show up as 100.00% instead of 99.99%, I also needed to set the progress to 1.0f explicitly to avoid floating point approximation problems. To avoid the problem with late updates pushing the progress over 1.0, I made the fields private and forced all users to go through the setters, which guarantee progress stays within 0.0 to 1.0.
> WI shows progress as 100.00% before actual completion (rounding error)
> ----------------------------------------------------------------------
>
> Key: HADOOP-243
> URL: http://issues.apache.org/jira/browse/HADOOP-243
> Project: Hadoop
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.1.0
> Reporter: Yoram Arnon
> Assigned To: Owen O'Malley
> Priority: Trivial
> Attachments: percent-complete.patch
>
>
> For jobs of over 50000 tasks, the rounding error in the WI is confusing.
> When less than 0.005% of the map (or reduce) tasks remain to execute, the WI shows progress as 100.00%, which is misleading.
> Rounding down to the nearest .01% would be better.
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