| Define the process of spilling in MapReduce
It is a process when we copy the data from memory buffer to disk when the buffer usage reaches a specific threshold size. And this will happen when we have not enough memory to fit all of the mapper output. And by default when thread reaches the 80 percent of buffer size is filled it will starts spilling.
To under stand we will take a example of 100 MB size buffer and it will start spilling once the content of buffer reaches Size OF 80 mb. | | |