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When running with master 'yarn' either HADOOP_CONF_DIR or YARN_CONF_DIR must be set

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When submitting a Spark application to run in a Hadoop YARN cluster, it may fail with the following error: Exception in thread "main" org.apache.spark.SparkException: When running with master 'yarn' either HADOOP_CONF_DIR or YARN_CONF_DIR must be set in the environment. at ...
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