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Integrating Apache Nutch and Hbase using Gora

There are six steps for using hbase as gora-nutch backend.

First, you have to download Nutch 2 from a mirror site of Apache. Download and extraxt it to where you want to install.

# tar -zxvf apache-nutch-2.X-src.tar.gz

Second, you have to downlad and install Hbase from a mirror site of Apache. Now Gora 0.2 supports Hbase 0.90.X branch.

Third, Gora backend must be specified in nutch-site.xml. Before compiling nutch, all usual configuration parameters should be set in the nutch-site.xml.

<property>
<name>storage.data.store.class</name>
<value>org.apache.gora.hbase.store.HBaseStore</value>
<description>Default class for storing data</description>
</property>

Fourth, gora-hbase dependency must be available in the ivy/ivy.xml.

<!-- Uncomment this to use HBase as Gora backend. -->
<dependency org="org.apache.gora" name="gora-hbase" rev="0.2" conf="*->default" />

Fifth, in the gora.properties file default datastore must be specified as HBaseStore.

gora.datastore.default=org.apache.gora.hbase.store.HBaseStore

Sixth, compile nutch. (Ant has to be available)

# ant runtime

Now, you should then be able to use nutch.


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Comments

  1. AnonymousAugust 28, 2013 at 10:29 AM

    hi, I have followed your steps. But when I run the nutch crawl command I am getting below exception..

    Exception in thread "main" java.lang.RuntimeException: job failed: name=generate: null, jobid=job_local1224515128_0002
    at org.apache.nutch.util.NutchJob.waitForCompletion(NutchJob.java:54)
    at org.apache.nutch.crawl.GeneratorJob.run(GeneratorJob.java:199)
    at org.apache.nutch.crawl.Crawler.runTool(Crawler.java:68)
    at org.apache.nutch.crawl.Crawler.run(Crawler.java:152)
    at org.apache.nutch.crawl.Crawler.run(Crawler.java:250)
    at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
    at org.apache.nutch.crawl.Crawler.main(Crawler.java:257)

    I use this command. PLease let me know your suggestions to fix this issue

    Thanks,
    RP

    ReplyDelete
  2. Kadir SertSeptember 3, 2013 at 9:45 AM

    Hi, can you give full crawl command you run?
    Second, have you run nutch as distributed or standalone mode?
    When you run nutch in $NUTCH_HOME/runtime/local folder that's standalone,
    When you run nutch from $NUTCH_HOME/runtime/deploy that's distributed.
    You may have forgotten specifying urls directory that should be injected for the first run.

    ReplyDelete
  3. AnonymousSeptember 28, 2013 at 2:18 AM

    Hi! I have the same error
    Run nutch in standalone folder
    Where is my script
    bin/nutch crawl urls -depth 3 -topN 5



    ReplyDelete
  4. AnonymousJanuary 13, 2016 at 4:57 AM

    Hello! I have the same error, but it happens with fetch. Here's my stacktrace:

    Exception in thread "main" java.lang.RuntimeException: job failed: name=fetch, jobid=job_local_0007
    at org.apache.nutch.util.NutchJob.waitForCompletion(NutchJob.java:54)
    at org.apache.nutch.fetcher.FetcherJob.run(FetcherJob.java:194)
    at org.apache.nutch.crawl.Crawler.runTool(Crawler.java:68)
    at org.apache.nutch.crawl.Crawler.run(Crawler.java:161)
    at org.apache.nutch.crawl.Crawler.run(Crawler.java:250)
    at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
    at org.apache.nutch.crawl.Crawler.main(Crawler.java:257)
    I ran the command bin/nutch crawl urls -depth 20 -topN 10000

    ReplyDelete

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