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https://issues.apache.org/jira/browse/NUTCH-3058?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sebastian Nagel resolved NUTCH-3058.
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Resolution: Implemented
> Fetcher: counter for hung threads
> ---------------------------------
>
> Key: NUTCH-3058
> URL: https://issues.apache.org/jira/browse/NUTCH-3058
> Project: Nutch
> Issue Type: Improvement
> Components: fetcher
> Affects Versions: 1.20
> Reporter: Sebastian Nagel
> Assignee: Sebastian Nagel
> Priority: Major
> Fix For: 1.21
>
>
> The Fetcher class defines a "hard" timeout defined as 50% of the MapReduce
> task timeout, see {{mapreduce.task.timeout}} and
> {{fetcher.threads.timeout.divisor}}. If there are fetcher threads running but
> without any progress during the timeout period (in terms of newly started
> fetch items), Fetcher is shut down to avoid that the task timeout is reached
> and the fetcher job is failed. The "hung threads" are logged together with
> the URL being fetched and (DEBUG level) the Java stack.
> In addition to logging, a job counter should indicate the number of hung
> threads. This would allow to see on the job level whether there are issues
> with hung threads. To trace the issues it's still required to look into the
> Hadoop task logs.
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