FileStatus getFileBeingSplit() {
    return fileBeingSplit;
  }
True if we are to run with bounded amount of writers rather than let the count blossom. Default
is 'false'. Does not apply if you have set 'hbase.wal.split.to.hfile' as that is always
bounded. Only applies when you are doing recovery to 'recovered.edits' files (the old default).
Bounded writing tends to have higher throughput.
hbase-server/src/main/java/org/apache/hadoop/hbase/wal/WALSplitter.java