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https://issues.apache.org/jira/browse/NUTCH-1084?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13882771#comment-13882771
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Tejas Patil commented on NUTCH-1084:
------------------------------------
The issue gets reproduced on current trunk. Attaching a test segment :
https://issues.apache.org/jira/secure/attachment/12625275/20140126210858.tgz
The workaround suggested by [~markus17] in comment above works correctly.
> 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
> Fix For: 1.9
>
>
> 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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