public void forceRoll(DiskRegion dr) {
    Oplog child = getChild();
    if (child != null) {
      child.forceRolling(dr);
    }
  }
Get the oplog specified

@param id int oplogId to be got
@return Oplogs the oplog corresponding to the oplodId, id
geode-core/src/main/java/org/apache/geode/internal/cache/PersistentOplogSet.java