  With the rapid increase in the Internet of Things (IoT), the amount of data
produced and processed is also increased. Cloud Computing facilitates the
storage, processing, and analysis of data as needed. However, cloud computing
devices are located far away from the IoT devices. Fog computing has emerged as
a small cloud computing paradigm that is near to the edge devices and handles
the task very efficiently. Fog nodes have a small storage capability than the
cloud node but it is designed and deployed near to the edge device so that
request must be accessed efficiently and executes in time. In this survey paper
we have investigated and analysed the main challenges and issues raised in
scheduling the task in fog computing environment. To the best of our knowledge
there is no comprehensive survey paper on challenges in task scheduling of fog
computing paradigm. In this survey paper research is conducted from 2018 to
2021 and most of the paper selection is done from 2020-2021. Moreover, this
survey paper organizes the task scheduling approaches and technically plans the
identified challenges and issues. Based on the identified issues, we have
highlighted the future work directions in the field of task scheduling in fog
computing environment.
