I'm a beginner in Hadoop and MapReduce. After I installed Hadoop on my Ubuntu VM, I tried some starter examples like Wordcount and Anagram.
I would like to do an Apriori on MapReduce. I found this one on Sourceforge (http://sourceforge.net/p/apriorimapred/wiki/Home/).
After I download and installed some required components such as HBase and Log4j (though I have problems installing log4j so I chose to disable them by setting the level to off),
I struggle with the problem
"Error: java.lang.ClassNotFoundException: org.apache.hadoop.hbase.HBaseConfiguration" -- as in the picture. (https://dl.dropboxusercontent.com/u/51053996/Pics/hadoop%20classnotfound.jpg)
It happens every time I would like to run the jar file. The steps I take are
1. javac -cp "$HADOOP_HOME/share/hadoop/mapreduce/hadoop-common-2.0.0-alpha.jar:$HADOOP_HOME/share/hadoop/mapreduce/hadoop-mapreduce-client-core-2.0.2-alpha.jar:$HADOOP_HOME/lib/commons-configuration-1.10/*:/usr/local/apache-log4j-1.2.17/log4j-1.2.17.jar:/usr/lib/hbase/hbase-0.94.8/hbase-0.94.8.jar" apriori.java
2. jar -cvf apriori.jar -C . .
3. $HADOOP_HOME/bin/hadoop jar /home/hduser/yarn/hadoop-2.5.1/share/hadoop/mapreduce/apriori.jar apriori /in /out2 /out2c /out2a
(The problem happens after I enter the command in step 3)
There is no error shown after I compiled in step 1 (However, I have tried compiling while not including the "/usr/lib/hbase/hbase-0.94.8/hbase-0.94.8.jar" and there are around 100 errors -- so I guess the lib works well).
I stick with this problem for around 2 weeks :( and couldn't find any working solutions. I have tried many suggestion I found such as fixing the environment variables, add some lines in hbase-env.sh, etc. Here are some that I bookmarked them (but didn't solve mine).
Thank you so much and really appreciated every help,
Spacez
I have solved this by re-installing Hadoop and HBase with compatible versions (I'm using Hadoop 2.5.1 and HBase 0.98.11). Also, adding correct classpaths of the Hadoop and Hbase jars in the hadoop-env.