Hi fellows
Below code segment add a shutdown hook to JVM, but when I got a strange
exception,
java.lang.IllegalStateException: Shutdown in progress
at
java.lang.ApplicationShutdownHooks.add(ApplicationShutdownHooks.java:39)
at java.lang.Runtime.addShutdownHook(Runtime.java:192)
at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:1387)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:191)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:95)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:180)
at org.apache.hadoop.fs.Path.getFileSystem(Path.java:175)
at young.Main$1.run(Main.java:21)
Java doc said this exception is threw when the virtual machine is already in
the process of shutting down, (http://java.sun.com/j2se/1.5.0/docs/api/),
what does this mean? Why this happen? How to fix ?
I'm really appreciate if you can try this code, and help me to figure out
what's going on here, thank you !
---------------------------------------------------------------------------------------
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.mapred.JobConf;
@SuppressWarnings("deprecation")
public class Main {
public static void main(String[] args) {
Runtime.getRuntime().addShutdownHook(new Thread() {
@Override
public void run() {
Path path = new Path("/temp/hadoop-young");
System.out.println("Thread run : " + path);
Configuration conf = new JobConf();
FileSystem fs;
try {
fs = path.getFileSystem(conf);
if(fs.exists(path)){
fs.delete(path);
}
} catch (Exception e) {
System.err.println(e.getMessage());
e.printStackTrace();
}
};
});
}
}
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