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I have implemented queue functionality here. and now it works effortlessly despite having multiple dags. We had multiple hiccups
as it was difficult to find the number of running dags and to maintian queue. for that we have introduced new files. $DAGU_HOME/queue/queue.json(to maintain queue), $DAGU/stats/stats.json(which only stores no of running dags - any dag while running will increment this and while finished running it will decrement this pointer).
Also introdused a new flag "w" as if the dag is coming from the queue, it will directly go to the running stage.
Introdused a new config variable - DAGQueueLength.