How HBase add its dependency jars and use HADOOP_CLASSPATH

2021-08-06T09:45:38

48. HBase, MapReduce, and the CLASSPATH

By default, MapReduce jobs deployed to a MapReduce cluster do not have access to either the HBase configuration under $HBASE_CONF_DIR or the HBase classes.

To give the MapReduce jobs the access they need, you could add hbase-site.xml_to _$HADOOP_HOME/conf and add HBase jars to the $HADOOP_HOME/lib directory. You would then need to copy these changes across your cluster. Or you could edit $HADOOP_HOME/conf/hadoop-env.sh and add hbase dependencies to the HADOOP_CLASSPATH variable. Neither of these approaches is recommended because it will pollute your Hadoop install with HBase references. It also requires you restart the Hadoop cluster before Hadoop can use the HBase data.

The recommended approach is to let HBase add its dependency jars and use HADOOP_CLASSPATH or -libjars.

I'm learning how HBase interacts with MapReduce

I know what the above two ways mean, but I don't know how to configure the recommended way

Could anyone tell me how to configure it in the recommended way?

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Author:「梅闻啼」,Reproduced under the CC 4.0 BY-SA copyright license with link to original source & disclaimer.
Link to:https://stackoverflow.com/questions/68675185/how-hbase-add-its-dependency-jars-and-use-hadoop-classpath

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Copyright License:Reproduced under the CC 4.0 BY-SA copyright license with link to original source & disclaimer.