can't really see what's going on with in-flight queries.
update in-flight queries more frequently by probing impalad hosts with in-flight queries.

questions)

1. how to update just a fraction of query information in datahub?
2. do we need an api for updating specific query on a specific host?

• or all queries on a specific host?
  1. how do i update "some" queries in web browser when "some" of queries are updated in datahub?