public MutableRegionInfo setOffline(boolean offLine) {
    this.offLine = offLine;
    return this;
  }
The parent of a region split is offline while split daughters hold references to the parent.
Offlined regions are closed.
@param offLine Set online/offline status.
hbase-client/src/main/java/org/apache/hadoop/hbase/client/MutableRegionInfo.java