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I am a hadoop beginner . I have inastelled Hadoop 3.1.1 on a cluster. As my OS is CentOS 6.9 (64bit), I recompiled Hadoop Native library and replaced it in HADOOP_HOME/lib. When I run wordcount example which is in "HADOOP_HOME/share/hadoop/mapreduce", I get: "Error: Could not find or load main class org.apache.hadoop.mapred.YarnChild". I found no answer except changing the version of Hadoop on the internet. Any idea about how to solve it? Thanks in advance

Ebrahim Salehi
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Thanks, it is solved. based on my exprience, any error about class not found is because of mapred-site.xml wrong configuration. a good config is here: hadoop pagerank error when running

Ebrahim Salehi
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  • Any class under `org.apache.hadoop.mapred` would be the mapred xml, yes. Other class not found exceptions, it widely depends on the application – OneCricketeer Aug 30 '18 at 14:20