You can use Hadoop built by others for the following reasons: First, Hadoop is an open source distributed computing framework that is maintained and improved by many communities and developers. So many people have built a reliable Hadoop cluster through their own experience and efforts and shared it with others. These Hadoop clusters built by others are usually optimized and debugged to provide good performance and stability.

In addition, using Hadoop clusters built by others can save time and effort in building and configuring them. Building and configuring a stable Hadoop cluster requires certain professional knowledge and experience, and using other people's clusters can avoid these tedious processes and directly start using Hadoop for data processing and analysis. This is especially useful for people who are not familiar with Hadoop.

Of course, using Hadoop clusters built by others also needs to pay attention to some problems. First, make sure that the Hadoop cluster version you use matches your own needs and application scenarios. Secondly, we should understand the configuration and performance parameters of the cluster and make appropriate adjustments according to our own needs. Finally, we should pay attention to the security of the cluster and the protection of data to ensure the confidentiality and integrity of data.

Generally speaking, using Hadoop cluster built by others is a fast, convenient and reliable choice, but it needs to be customized and configured according to its own needs to ensure that the advantages and functions of Hadoop are fully exerted.