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https://issues.apache.org/jira/browse/NUTCH-628?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12882543#action_12882543
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Alex McLintock commented on NUTCH-628:
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As part of this fix can someone check that the documentation is up to date too.
I've added a page to our wiki based upon the example above (and yes - it seems
to work with a very recent 1.1RC)
http://wiki.apache.org/nutch/DomainStatistics
I'm not happy I understand the parameters though eg
nu...@reynolds:/nutch/search$ bin/nutch
org.apache.nutch.util.domain.DomainStatistics crawl/crawldb ds-host host 2
Exception in thread "main" java.io.FileNotFoundException: File does not exist:
hdfs://rio46:9000/user/nutch/crawl/crawldb/current/data
at
org.apache.hadoop.hdfs.DistributedFileSystem.getFileStatus(DistributedFileSystem.java:457)
at
org.apache.hadoop.mapred.SequenceFileInputFormat.listStatus(SequenceFileInputFormat.java:51)
at
org.apache.hadoop.mapred.FileInputFormat.getSplits(FileInputFormat.java:201)
at org.apache.hadoop.mapred.JobClient.writeOldSplits(JobClient.java:810)
at
org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:781)
at org.apache.hadoop.mapred.JobClient.submitJob(JobClient.java:730)
at org.apache.hadoop.mapred.JobClient.runJob(JobClient.java:1249)
at
org.apache.nutch.util.domain.DomainStatistics.run(DomainStatistics.java:113)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
at
org.apache.nutch.util.domain.DomainStatistics.main(DomainStatistics.java:204)
nu...@reynolds:/nutch/search$
But this worked.
nu...@reynolds:/nutch/search$ bin/nutch
org.apache.nutch.util.domain.DomainStatistics
hdfs://rio46:9000/user/nutch/crawl/crawldb/current/ ds-host host 2
> Host database to keep track of host-level information
> -----------------------------------------------------
>
> Key: NUTCH-628
> URL: https://issues.apache.org/jira/browse/NUTCH-628
> Project: Nutch
> Issue Type: New Feature
> Components: fetcher, generator
> Reporter: Otis Gospodnetic
> Attachments: domain_statistics_v2.patch,
> NUTCH-628-DomainStatistics.patch, NUTCH-628-HostDb.patch
>
>
> Nutch would benefit from having a DB with per-host/domain/TLD information.
> For instance, Nutch could detect hosts that are timing out, store information
> about that in this DB. Segment/fetchlist Generator could then skip such
> hosts, so they don't slow down the fetch job. Another good use for such a DB
> is keeping track of various host scores, e.g. spam score.
> From the recent thread on nutch-u...@lucene:
> Otis asked:
> > While we are at it, how would one go about implementing this DB, as far as
> > its structures go?
> Andrzej said:
> The easiest I can imagine is to use something like <Text, MapWritable>.
> This way you could store arbitrary information under arbitrary keys.
> I.e. a single database then could keep track of aggregate statistics at
> different levels, e.g. TLD, domain, host, ip range, etc. The basic set
> of statistics could consist of a few predefined gauges, totals and averages.
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