Override to provide writer method
Override to provide writer method
context used to do distributed write
map with params to control format and execution of the write
root directory to write to
usually a matrix like collection to write
flags whether to sort the rows by value descending
Call this method to perform the write, usually no need to override.
Call this method to perform the write, usually no need to override.
what to write
root directory to write to
Writer trait is abstract in the sense that the writer method must be supplied by an extending trait, which also defines the type to be written.
type of object to write, usually a matrix type thing.