public long getTTL() {
    byte[] ttlBytes = getAttribute(OP_ATTRIBUTE_TTL);
    if (ttlBytes != null) {
      return Bytes.toLong(ttlBytes);
    }
    return Long.MAX_VALUE;
  }
Return the TTL requested for the result of the mutation, in milliseconds.
@return the TTL requested for the result of the mutation, in milliseconds, or Long.MAX_VALUE if
        unset
hbase-client/src/main/java/org/apache/hadoop/hbase/client/Mutation.java