public void setProperties(java.util.Map<String, String> properties) {
        this.properties = properties == null ? null : new com.amazonaws.internal.SdkInternalMap<String, String>(properties);
    }
<p>
The list of Java properties that are set when the step runs. You can use these properties to pass key-value pairs
to your main function.
</p>

@param properties
       The list of Java properties that are set when the step runs. You can use these properties to pass
       key-value pairs to your main function.
aws-java-sdk-emr/src/main/java/com/amazonaws/services/elasticmapreduce/model/HadoopStepConfig.java