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https://issues.apache.org/jira/browse/CONNECTORS-1602?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16826707#comment-16826707
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Donald Van den Driessche commented on CONNECTORS-1602:
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Ok, thanks. That already clears some things up.

How does Manifold know a document doesn't change that often if it isn't crawled?

If a full crawling takes about 8 hours, but you make your recrawl intervals 
smaller than that. Will it start recrawling before the job has completed a full 
run? And if so, may that interfere with the termination of the job? So that it 
might not get to a full run?

> Continuous crawling doesn't recrawl everything
> ----------------------------------------------
>
>                 Key: CONNECTORS-1602
>                 URL: https://issues.apache.org/jira/browse/CONNECTORS-1602
>             Project: ManifoldCF
>          Issue Type: Bug
>          Components: Web connector
>            Reporter: Donald Van den Driessche
>            Priority: Major
>
> When crawling a website in continuous crawling mode we saw that not all 
> documents are recrawled.
> The site is quite extensive. We figured out that after crawling a 
> document/page gets a recrawl timestamp in between the recrawl interval and 
> max recrawl interval.
> But if these values occur within the first crawl, Manifold starts recrawling 
> those, but seems to ignore the rest of the website. Also sometimes documents 
> get recrawled 5 times while other don't get recrawled. Apparently due to the 
> same issue.
>  
> Is it possible to shed a bit more light on the continuous crawling?
> Is it a good system to use for crawling a (extensive) website?



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