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From "Karanjeet Singh (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (NUTCH-1084) ReadDB url throws exception
Date Fri, 18 Nov 2016 07:56:58 GMT

    [ https://issues.apache.org/jira/browse/NUTCH-1084?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15676085#comment-15676085
] 

Karanjeet Singh commented on NUTCH-1084:
----------------------------------------

Well, I am the lucky person who has ended up here.

[~markus17]
Looks like Hadoop 2.7.3 is released. Are we planning to upgrade the same in Nutch? It's currently
on 2.7.2

> ReadDB url throws exception
> ---------------------------
>
>                 Key: NUTCH-1084
>                 URL: https://issues.apache.org/jira/browse/NUTCH-1084
>             Project: Nutch
>          Issue Type: Bug
>    Affects Versions: 1.3
>            Reporter: Markus Jelsma
>            Assignee: Markus Jelsma
>         Attachments: NUTCH-1084.patch
>
>
> Readdb -url suffers from two problems:
> 1. it trips over the _SUCCESS file generated by newer Hadoop version
> 2. throws can't find class: org.apache.nutch.protocol.ProtocolStatus (???)
> The first problem can be remedied by not allowing the injector or updater to write the
_SUCCESS file. Until now that's the solution implemented for similar issues. I've not been
successful as to make the Hadoop readers simply skip the file.
> The second issue seems a bit strange and did not happen on a local check out. I'm not
yet sure whether this is a Hadoop issue or something being corrupt in the CrawlDB. Here's
the stack trace:
> {code}
> Exception in thread "main" java.io.IOException: can't find class: org.apache.nutch.protocol.ProtocolStatus
because org.apache.nutch.protocol.ProtocolStatus
>         at org.apache.hadoop.io.AbstractMapWritable.readFields(AbstractMapWritable.java:204)
>         at org.apache.hadoop.io.MapWritable.readFields(MapWritable.java:146)
>         at org.apache.nutch.crawl.CrawlDatum.readFields(CrawlDatum.java:278)
>         at org.apache.hadoop.io.SequenceFile$Reader.getCurrentValue(SequenceFile.java:1751)
>         at org.apache.hadoop.io.MapFile$Reader.get(MapFile.java:524)
>         at org.apache.hadoop.mapred.MapFileOutputFormat.getEntry(MapFileOutputFormat.java:105)
>         at org.apache.nutch.crawl.CrawlDbReader.get(CrawlDbReader.java:383)
>         at org.apache.nutch.crawl.CrawlDbReader.readUrl(CrawlDbReader.java:389)
>         at org.apache.nutch.crawl.CrawlDbReader.main(CrawlDbReader.java:514)
>         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>         at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>         at java.lang.reflect.Method.invoke(Method.java:597)
>         at org.apache.hadoop.util.RunJar.main(RunJar.java:156)
> {code}



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