@Override
  public byte peek() {
    return bytes[offset + position];
  }
Update the length of this range. {@code offset + length} should not be greater than
{@code bytes.length}. If {@code position} is greater than the new {@code length}, sets
{@code position} to {@code length}. The new length of this range.
@return this.
hbase-common/src/main/java/org/apache/hadoop/hbase/util/AbstractPositionedByteRange.java