public RegionLocator getRegionLocator() {
      return regionLocator;
    }
Writes HFiles. Passed Cells must arrive in order. Writes current time as the sequence id for the
file. Sets the major compacted attribute on created {@link HFile}s. Calling write(null,null) will
forcibly roll all HFiles being written.
<p>
Using this class as part of a MapReduce job is best done using
{@link #configureIncrementalLoad(Job, TableDescriptor, RegionLocator)}.
hbase-mapreduce/src/main/java/org/apache/hadoop/hbase/mapreduce/HFileOutputFormat2.java