druid-io/druid-api — pull request #25 by zhenchuan (2014-10-26 03:57:10+00:00)
Title: try to avoid using the String's replace method...

when using the replace method, additional string object will generate ,which will burden the GC...
especially when you have many metrics and all your metric values is just number type without `,` , there's no need to using the replace method...