@Override
  public Boolean call() {
    try {
      LOG.info("Moving region: {} from {} to {}", region.getEncodedName(), sourceServer,
        targetServer);
      admin.move(region.getEncodedNameAsBytes(), targetServer);
      LOG.info("Requested move {} from {} to {}", region.getEncodedName(), sourceServer,
        targetServer);
    } catch (Exception e) {
      LOG.error("Error Moving Region: {}", region.getEncodedName(), e);
    } finally {
      movedRegions.add(region);
    }
    return true;
  }
Move Regions without Acknowledging.Usefule in case of RS shutdown as we might want to shut the RS
down anyways and not abort on a stuck region. Improves movement performance
hbase-server/src/main/java/org/apache/hadoop/hbase/util/MoveWithoutAck.java