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https://issues.apache.org/jira/browse/NUTCH-503?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vishal Shah updated NUTCH-503:
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Attachment: emptyfetchlist.patch
Hi,
The previous patch is missing a header line. I've reattached the patch.
> Generator exits incorrectly for small fetchlists
> -------------------------------------------------
>
> Key: NUTCH-503
> URL: https://issues.apache.org/jira/browse/NUTCH-503
> Project: Nutch
> Issue Type: Bug
> Components: generator
> Affects Versions: 0.8, 0.8.1, 0.9.0
> Environment: Fedora Core 2, JDK 1.6
> Reporter: Vishal Shah
> Fix For: 0.8.2
>
> Attachments: emptyfetchlist.patch, emptyfetchlist.patch
>
>
> I think I found the reason why the generator returns with an empty
> fetchlist for small fetchsizes.
>
> After the first job finishes running, the generator checks the following
> condition to see if it got an empty list:
>
> if (readers == null || readers.length == 0 || !readers[0].next(new
> FloatWritable())) {
>
> The third condition is incorrect here. In some cases, esp. for small
> fetchlists, the first partition might be empty, but some other partition(s)
> might contain urls. In this case, the Generator is incorrectly assuming that
> all partitions are empty by just looking at the first. This problem could
> also occur when all URLs in the fetchlist are from the same host (or from a
> very small number of hosts, or from a number of hosts that all map to a small
> number of partitions).
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