The default value is 1. This default value creates one copy of each block, in addition
to the original block. When the INNAMEONLY option is specified, the default is 2.
Replicated blocks are used to provide fault tolerance for HDFS. If a machine in the
cluster becomes unavailable, then the blocks needed for the
SASHDAT file can be retrieved from replications on other machines.
You can specify COPIES=0 to avoid creating redundant blocks for the SASHDAT file.
This option can be useful to preserve storage space when you have redundancy for
the source data.