e1eef248f1
The following deadlock may happen if shutdownHook and StreamingContext.stop are running at the same time. ``` Java stack information for the threads listed above: =================================================== "Thread-2": at org.apache.spark.streaming.StreamingContext.stop(StreamingContext.scala:699) - waiting to lock <0x00000005405a1680> (a org.apache.spark.streaming.StreamingContext) at org.apache.spark.streaming.StreamingContext.org$apache$spark$streaming$StreamingContext$$stopOnShutdown(StreamingContext.scala:729) at org.apache.spark.streaming.StreamingContext$$anonfun$start$1.apply$mcV$sp(StreamingContext.scala:625) at org.apache.spark.util.SparkShutdownHook.run(ShutdownHookManager.scala:266) at org.apache.spark.util.SparkShutdownHookManager$$anonfun$runAll$1$$anonfun$apply$mcV$sp$1.apply$mcV$sp(ShutdownHookManager.scala:236) at org.apache.spark.util.SparkShutdownHookManager$$anonfun$runAll$1$$anonfun$apply$mcV$sp$1.apply(ShutdownHookManager.scala:236) at org.apache.spark.util.SparkShutdownHookManager$$anonfun$runAll$1$$anonfun$apply$mcV$sp$1.apply(ShutdownHookManager.scala:236) at org.apache.spark.util.Utils$.logUncaughtExceptions(Utils.scala:1697) at org.apache.spark.util.SparkShutdownHookManager$$anonfun$runAll$1.apply$mcV$sp(ShutdownHookManager.scala:236) at org.apache.spark.util.SparkShutdownHookManager$$anonfun$runAll$1.apply(ShutdownHookManager.scala:236) at org.apache.spark.util.SparkShutdownHookManager$$anonfun$runAll$1.apply(ShutdownHookManager.scala:236) at scala.util.Try$.apply(Try.scala:161) at org.apache.spark.util.SparkShutdownHookManager.runAll(ShutdownHookManager.scala:236) - locked <0x00000005405b6a00> (a org.apache.spark.util.SparkShutdownHookManager) at org.apache.spark.util.SparkShutdownHookManager$$anon$2.run(ShutdownHookManager.scala:216) at org.apache.hadoop.util.ShutdownHookManager$1.run(ShutdownHookManager.java:54) "main": at org.apache.spark.util.SparkShutdownHookManager.remove(ShutdownHookManager.scala:248) - waiting to lock <0x00000005405b6a00> (a org.apache.spark.util.SparkShutdownHookManager) at org.apache.spark.util.ShutdownHookManager$.removeShutdownHook(ShutdownHookManager.scala:199) at org.apache.spark.streaming.StreamingContext.stop(StreamingContext.scala:712) - locked <0x00000005405a1680> (a org.apache.spark.streaming.StreamingContext) at org.apache.spark.streaming.StreamingContext.stop(StreamingContext.scala:684) - locked <0x00000005405a1680> (a org.apache.spark.streaming.StreamingContext) at org.apache.spark.streaming.SessionByKeyBenchmark$.main(SessionByKeyBenchmark.scala:108) at org.apache.spark.streaming.SessionByKeyBenchmark.main(SessionByKeyBenchmark.scala) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:497) at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:680) at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:180) at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:205) at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:120) at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala) ``` This PR just moved `ShutdownHookManager.removeShutdownHook` out of `synchronized` to avoid deadlock. Author: zsxwing <zsxwing@gmail.com> Closes #9116 from zsxwing/stop-deadlock. |
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