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From "Marek Bachmann (Commented) (JIRA)" <>
Subject [jira] [Commented] (NUTCH-1084) ReadDB url throws exception
Date Sat, 03 Dec 2011 16:30:39 GMT


Marek Bachmann commented on NUTCH-1084:

The same Exception is thrown when using the -get option in readseg. 
Is there some workaround yet? It is not efficient to copy the whole seg dir to a local drive...
> ReadDB url throws exception
> ---------------------------
>                 Key: NUTCH-1084
>                 URL:
>             Project: Nutch
>          Issue Type: Bug
>    Affects Versions: 1.3
>            Reporter: Markus Jelsma
>            Assignee: Markus Jelsma
>             Fix For: 1.5
> 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" can't find class: org.apache.nutch.protocol.ProtocolStatus
because org.apache.nutch.protocol.ProtocolStatus
>         at
>         at
>         at org.apache.nutch.crawl.CrawlDatum.readFields(
>         at$Reader.getCurrentValue(
>         at$Reader.get(
>         at org.apache.hadoop.mapred.MapFileOutputFormat.getEntry(
>         at org.apache.nutch.crawl.CrawlDbReader.get(
>         at org.apache.nutch.crawl.CrawlDbReader.readUrl(
>         at org.apache.nutch.crawl.CrawlDbReader.main(
>         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>         at sun.reflect.NativeMethodAccessorImpl.invoke(
>         at sun.reflect.DelegatingMethodAccessorImpl.invoke(
>         at java.lang.reflect.Method.invoke(
>         at org.apache.hadoop.util.RunJar.main(
> {code}

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