[jira] [Created] (NUTCH-1747) Use AtomicInteger as semaphore in Fetcher

["Julien Nioche (JIRA)" <ji...@apache.org>]

Julien Nioche created NUTCH-1747:
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             Summary: Use AtomicInteger as semaphore in Fetcher
                 Key: NUTCH-1747
                 URL: https://issues.apache.org/jira/browse/NUTCH-1747
             Project: Nutch
          Issue Type: Improvement
          Components: fetcher
    Affects Versions: 1.8
            Reporter: Julien Nioche
            Priority: Minor


In Fetcher we currently use 

Set<FetchItem>  inProgress = Collections.synchronizedSet(new HashSet<FetchItem>());

as semaphore within the FetchItemQueues to keep track of the URLs being fetched and prevent threads from pulling from them. It works fine but we could use AtomicIntegers instead as all we need is the counts, not the contents.

This change would have little impact on the performance but would make the code a bit cleaner.



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