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The "ErrorMessagesInNutch2" page has been changed by LewisJohnMcgibbney: http://wiki.apache.org/nutch/ErrorMessagesInNutch2?action=diff&rev1=2&rev2=3 When using different Gora storage mechanisms we have to manually tweak the Nutch Ivy configuration depending on the choice of Gora store, in this case Cassandra. - This is what was added to ivy/ivy.xml: + To resolve this error the following was added to $NUTCH_HOME/ivy/ivy.xml: {{{ <dependency org="org.apache.gora" name="gora-cassandra" rev="0.2-incubating" conf="*->compile"/> <dependency org="org.apache.cassandra" name="cassandra-thrift" rev="0.8.1"/> @@ -51, +51 @@ <dependency org="org.apache.cassandra" name="apache-cassandra" rev="0.8.1"/> <dependency org="me.prettyprint" name="hector-core" rev="0.8.0-2"/> }}} + then the following ant commands were executed + {{{ + $ ant clean + $ ant + }}} + This specified the correct dependencies to be downloaded by Ivy which were then bundled into the nutch-2.0-dev.job file. In this particular case it was mentioned that Cloudera CDH3 was being used. It has a hue plugins jar with an older thrift library in it, therefore removing this jar from the classpath resolved further errors with running Nutch in distributed mode. Correspondence on this error can be seen in context [[http://www.mail-archive.com/dev%40nutch.apache.org/msg03482.html|here]] + == Missing plugins whilst running Nutch 2.0 on Cloudera's CDH3 == + + Cloudera's CDH3 is Cloudera's distribution including Apache Hadoop. More information can be found [[https://ccp.cloudera.com/display/CDHDOC/CDH3+Quick+Start+Guide|here]]. This common error results due to a bug in MAPREDUCE-967 which modifies the way MapReduce unpacks the job's jar. The old way was to unpack the whole of it, now only classes/ and lib/ are unpacked. This way nutch is missing the plugins/ directory. A workaround is to force unpacking of the plugin/ directory. This can be done by adding the following properties to nutch-site.xml + {{{ + <property> + <name>mapreduce.job.jar.unpack.pattern</name> + <value>(?:classes/|lib/|plugins/).*</value> + </property> + + <property> + <name>plugin.folders</name> + <value>${job.local.dir}/../jars/plugins</value> + </property> + }}} + It is then necessary to recreate the Nutch job file using ant. +
