在命令行中编译:javac com/hook/HookTest3.java 在命令行中运行:Java com.hook.HookTest3 (之后按下Ctrl+C) 运行结果: 上面是java的,下面来看看spark的ShutdownHookManager ShutdownHookManager的创建是在SparkContext中,为了在Spark程序挂掉的时候,处理一些清理工作 /** ShutdownHookManager的创建,为了在Spark程序...
Hive的ShutdownHookManager是一个工具类,该类通过静态方法向JVM(java.lang.ApplicationShutdownHooks)注册了一个注册了一个Shutdown hook线程。在该hook中允许用户添加一些用于执行清理工作的线程,在系统退出时根据注册的优先级依次执行。 // org.apache.hive.common.util.ShutdownHookManager static { MGR.addShutdown...
ShutdownHookManager的创建是在SparkContext中,为了在Spark程序挂掉的时候,处理一些清理工作 /** ShutdownHookManager的创建,为了在Spark程序挂掉的时候,处理一些清理工作*/_shutdownHookRef=ShutdownHookManager.addShutdownHook( ShutdownHookManager.SPARK_CONTEXT_SHUTDOWN_PRIORITY) { ()=>logInfo("Invoking stop()...
// SparkContext在初始化时注册,设定优先级和要调用的函数_shutdownHookRef=ShutdownHookManager.addShutdownHook(ShutdownHookManager.SPARK_CONTEXT_SHUTDOWN_PRIORITY){()=>logInfo("Invoking stop() from shutdown hook")try{stop()// 关闭SparkContext时要释放清理的对象}catch{casee:Throwable=>logWarning("I...
17/05/05 06:03:53 INFO ApplicationMaster: Deleting staging directory hdfs://ip-172-30-0-86.ec2.internal:8020/user/hadoop/.sparkStaging/application_1493961816416_0002 17/05/05 06:03:53 INFO ShutdownHookManager: Shutdown hook called 17/05/05 06:03:53 INFO ShutdownHookManager: Deleting ...
ShutdownHookManager.removeShutdownHook介绍 [英]Removes a shutdownHook. [中]移除关机钩。 代码示例 代码示例来源:origin: apache/hive /** * Removes a shutdownHook. * * @param shutdownHook shutdownHook to remove. * @return TRUE if the shutdownHook was registered and removed, ...
Caused by: java.lang.NoSuchFieldException: SHUTDOWN_HOOK_PRIORITY at java.lang.Class.getField(Class.java:1695) at org.apache.spark.util.SparkShutdownHookManager.install(ShutdownHookManager.scala:223) at org.apache.spark.util.ShutdownHookManager$.shutdownHooks$lzycompute(ShutdownHookManager.scala:...
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按照优先级在关闭时执行一系列操作,在spark内用途很广泛,主要是释放资源,删除文件等 使用 // SparkContext在初始化时注册,设定优先级和要调用的函数 _shutdownHookRef = ShutdownHookManager.addShutdownHook( ShutdownHookManager.SPARK_CONTEXT_SHUTDOWN_PRIORITY) { () => ...