1. A method comprising: receiving, at a computer system, a file comprising log records generated by a data stream processing server, the log records including information pertaining to a query plan and a sequence of events executed by the data stream processing server in accordance with the query plan; generating, by the computer system, a graphical representation of the query plan based on the log records; displaying, by the computer system, the graphical representation; wherein the graphical representation depicts one or more queue objects; and as the computer system processes queue-based events reflected in the log records, the computer system modifies the graphical representation to indicate, for each particular queue object of the one or more queue objects, a current state of the particular queue object.