public OverflowOplog getChild(int oplogId) {
    OverflowOplog result = overflowMap.get(oplogId);
    if (result == null) {
      synchronized (compactibleOverflowMap) {
        result = compactibleOverflowMap.get(oplogId);
      }
    }
    return result;
  }
@param minSize the minimum size this oplog can be
geode-core/src/main/java/org/apache/geode/internal/cache/OverflowOplogSet.java