I noticed some weird behavior with NingWSClient 2.4.3. when used with Spark.
Spin up spark-shell with play-ws2.4.3 in driver class path
Run this code val myConfig = new AsyncHttpClientConfigBean()
val oneMinute = 60000
val client = NingWSClient(config)
Spark-shell won’t quit. It will just sit there
Open a new spark shell, repeat the above code. And then client.close
Spark-shell quits normally
In context of a spark-application, the spark application won’t quit even though the jobs are complete and your main method has exited. It will sit there with the executors holding on to the cores. Looking
at the thread dump, it seems like NingWSCLient starts a few threads, and the threads don’t die even after the spark application’s main method quits. Calling client.close cleans up the background threads and the application can exit normally.
Has anyone seen this before?
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