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How HBase implements delete operations

I read http://hbase.apache.org/book/versions.html and have a question about
delete operation. As it mentions, the user can delete a whole row or delete
a data version of cell. The delete operation of data version of cell is
just to write a tombstone marker for that version. I want to know how about
delete a row? Does HBase deletes the row immediately? or use the same
strategy as deleting a data version which create a tombstone for that row
key?  Or create a tombstone for every data version belongs to that row?