Unable to process special characters in openTSDB

Question

I am posting the temperature value form my java code to opentsdb. So in one of the tags I wanted to display the measurement-type like whether the reading is in °C or °F. So I tried to post the unicode "\u00b0" from java, though in the System.out.println I am able to see the degree symbol but when I post the opentsdb is not accepting the value.

I also read the article where it defines the characters which are accepted by opentsdb.(in the Metrics and Tags section) and it defines that it accepts Unicode letters. but when I try to send the unicode of degree it doesn't work. So does it accept the unicode of these characters? How can I send them. http://opentsdb.net/docs/build/html/user_guide/writing.html

is it means that Unicode is allowed but only for supported special characters not for all the special characters??? I am using openTSDB 2.2.0 version.

Answer 1

The doc says they have to be letters.

Character.isLetter('°')
// false

This is an "other symbol".

Character.getType('°') == Character.OTHER_SYMBOL