clojure - Jetty threads getting blocked and dead locked -

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i using jetty "7.6.8.v20121106" part of https://github.com/ring-clojure/ring/tree/master/ring-jetty-adapter server.

i making calls using http://http-kit.org/ following code. making server calls ignoring response. finding server threads become blocked/deadlocked after that. seems easy way bring server down , wanted understand going on here.

code client is:

(require '[org.httpkit.client :as hk-client])   (defn hget [id]    (hk-client/get (str "http://localhost:5000/v1/pubapis/auth/ping?ping=" id)))  (doall (map hget (take 100 (range))))) ; gives problem (doall (map deref (map hget (take 100 (range)))))) ; doesn't give problem

thread status threads blocked at

sun.nio.cs.streamencoder.write(streamencoder.java:118)

and deadlocked at

java.io.printstream.write(printstream.java:479)

would appreciate if can going on over here.

finally found problem was. took lot of digging through , starting sample project find this. when started learning clojure , copied following somewhere logging:

(defn log [msg & vals]   (let [line (apply format msg vals)]     (locking system/out (println line))))

the line locking on there causing dead lock in situation. not know enough concurrency solve this. create separate question that.

removing line fixes problem.


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