Add Trident MapState implementation

[worldpeaceinmind]

Question, Got confused, It says that it is supposed to have three types of states, non-transactional , transactional, opaque-transactional to work with the trident spouts to achieve the exact once semantic, so which one is this?

am I going to have duplicates in my state update? if so how should I implement the transactional? and also opaque-transactional doesn't apply this case right?

[ptgoetz]

It sounds like you are looking for a MapState implementation backed by HDFS, which hasn't been implemented yet.

[worldpeaceinmind]

so can i say the current implementation is ListState? do i need to compare the txId to make transnational?