Hi , I'm getting this error when I submit this query

select count(2),OriginCityName,DestCityName,FlightDate from Flight where FlightDate >= ‘2015-03-01’ and FlightDate <= ‘2015-03-31’ group by OriginCityName,DestCityName,FlightDate;

Error:

org.apache.druid.java.util.common.RE: Failure getting results for query[04b3a118-2c72-4b21-9003-16eefe3e615f] url[http://localhost:8083/druid/v2/] because of [org.jboss.netty.channel.ChannelException: Channel disconnected]

Can you try increasing number of http connections on Broker Node?

Here’s a similar case: https://groups.google.com/forum/#!topic/druid-user/w3mJK3H7h48