private void removeOverflow(DiskRegion dr, DiskEntry entry) {
    // find the overflow oplog that it is currently in and remove the entry from it
    DiskId id = entry.getDiskId();
    synchronized (id) {
      long oplogId = id.setOplogId(-1);
      if (oplogId != -1) {
        synchronized (overflowMap) { // to prevent concurrent remove see bug 41646
          OverflowOplog oplog = getChild((int) oplogId);
          if (oplog != null) {
            oplog.remove(dr, entry);
          }
        }
      }
    }
  }
@param minSize the minimum size this oplog can be
geode-core/src/main/java/org/apache/geode/internal/cache/OverflowOplogSet.java