JvmShutdownSafeguard (Flink : Runtime 2.0.0 API)

java.lang.Object
- java.lang.Thread
- - org.apache.flink.runtime.util.JvmShutdownSafeguard

All Implemented Interfaces:

Runnable
```
public class JvmShutdownSafeguard
extends Thread
```
A utility that guards against blocking shutdown hooks that block JVM shutdown.
When the JVM shuts down cleanly (SIGTERM or System.exit(int)) it runs all installed shutdown hooks. It is possible that any of the shutdown hooks blocks, which causes the JVM to get stuck and not exit at all.
This utility installs a shutdown hook that forcibly terminates the JVM if it is still alive a certain time after clean shutdown was initiated. Even if some shutdown hooks block, the JVM will terminate within a certain time.

Nested Class Summary
- Nested classes/interfaces inherited from class java.lang.Thread
  Thread.State, Thread.UncaughtExceptionHandler

Field Summary
- Fields inherited from class java.lang.Thread
  MAX_PRIORITY, MIN_PRIORITY, NORM_PRIORITY

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`static void`	`installAsShutdownHook(org.slf4j.Logger logger)`	Installs the safeguard shutdown hook.
`static void`	`installAsShutdownHook(org.slf4j.Logger logger, long delayMillis)`	Installs the safeguard shutdown hook.
`void`	`run()`

Methods inherited from class java.lang.Thread
activeCount, checkAccess, clone, countStackFrames, currentThread, dumpStack, enumerate, getAllStackTraces, getContextClassLoader, getDefaultUncaughtExceptionHandler, getId, getName, getPriority, getStackTrace, getState, getThreadGroup, getUncaughtExceptionHandler, holdsLock, interrupt, interrupted, isAlive, isDaemon, isInterrupted, join, join, join, onSpinWait, resume, setContextClassLoader, setDaemon, setDefaultUncaughtExceptionHandler, setName, setPriority, setUncaughtExceptionHandler, sleep, sleep, start, stop, suspend, toString, yield

Methods inherited from class java.lang.Object
equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Method Detail
  - run
```
public void run()
```
    Specified by:
    
    run in interface Runnable
    
    Overrides:
    
    run in class Thread
  - installAsShutdownHook
```
public static void installAsShutdownHook(org.slf4j.Logger logger)
```
    Installs the safeguard shutdown hook. The maximum time that the JVM is allowed to spend on shutdown before being killed is five seconds.
    
    Parameters:
    
    logger - The logger to log errors to.
  - installAsShutdownHook
```
public static void installAsShutdownHook(org.slf4j.Logger logger,
                                         long delayMillis)
```
    Installs the safeguard shutdown hook. The maximum time that the JVM is allowed to spend on shutdown before being killed is the given number of milliseconds.
    
    Parameters:
    
    logger - The logger to log errors to.
    
    delayMillis - The delay (in milliseconds) to wait after clean shutdown was stared, before forcibly terminating the JVM.