@Override
  public MultiByteBuff rewind() {
    checkRefCount();
    for (int i = 0; i < this.items.length; i++) {
      this.items[i].rewind();
    }
    this.curItemIndex = 0;
    this.curItem = this.items[this.curItemIndex];
    this.markedItemIndex = -1;
    return this;
  }
Rewinds this MBB and the position is set to 0
@return this object
hbase-common/src/main/java/org/apache/hadoop/hbase/nio/MultiByteBuff.java