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https://issues.apache.org/jira/browse/NUTCH-1679?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14069567#comment-14069567
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Alexander Kingson commented on NUTCH-1679:
------------------------------------------
Hi,
I was suggesting to close the datastore by adding this function
protected void cleanup(Context context) throws IOException,
InterruptedException {
store.close();
};
to reducer class.
Also, I found another issue, when inlink data is wiped out in the next
updatedb stages. To solve this issue I replaced these lines
if (page.getInlinks() != null) {
page.getInlinks().clear();
}
with
if (page.getInlinks() != null&& !inlinkedScoreData.isEmpty()) {
page.getInlinks().clear();
}
This code change is tested only in one case, and I am not sure if it solves
the issue permanently.
Thanks.
Alex.
> UpdateDb using batchId, link may override crawled page.
> -------------------------------------------------------
>
> Key: NUTCH-1679
> URL: https://issues.apache.org/jira/browse/NUTCH-1679
> Project: Nutch
> Issue Type: Bug
> Affects Versions: 2.2.1
> Reporter: Tien Nguyen Manh
> Priority: Critical
> Fix For: 2.3
>
> Attachments: NUTCH-1679.patch
>
>
> The problem is in Hbase store, not sure about other store.
> Suppose at first crawl cycle we crawl link A, then get an outlink B.
> In second cycle we crawl link B which also has a link point to A
> In second updatedb we load only page B from store, and will add A as new link
> because it doesn't know A already exist in store and will override A.
> UpdateDb must be run without batchId or we must set additionsAllowed=false
> Here are code for new page
> page = new WebPage();
> schedule.initializeSchedule(url, page);
> page.setStatus(CrawlStatus.STATUS_UNFETCHED);
> try {
> scoringFilters.initialScore(url, page);
> } catch (ScoringFilterException e) {
> page.setScore(0.0f);
> }
> new page will override old page status, score, fetchTime, fetchInterval,
> retries, metadata[CASH_KEY]
> - i think we can change something here so that new page will only update one
> column for example 'link' and if it is really a new page, we can initialize
> all above fields in generator
> - or we add operator checkAndPut to store so when add new page we will check
> if already exist first
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