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From "Steve Loughran (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8096) add single point where System.exit() is called for better handling in containers
Date Tue, 21 Feb 2012 12:25:34 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8096?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13212539#comment-13212539
] 

Steve Loughran commented on HADOOP-8096:
----------------------------------------

code would look something like this:

{code}

public class Exiter {

  public static Log LOG = LogFactory.getLog(Exiter.class);

  public static void SystemExit(int exitCode, int reason) {
    String operation = Thread.currentThread() + ": exiting with code "
        + exitCode + " reason" + reason;
    LOG.info(operation);
    try {
      System.exit(exitCode);
    } catch (SecurityException e) {
      LOG.info(operation + " trapped by security manager");
      throw new SecurityException(operation, e);
    }
  }
}

{code}

Calls of System.exit in -hdfs and -mapreduce would be replaced by calls of this with a reason
string. Maybe an exception could optionally be passed down too.
                
> add single point where System.exit() is called for better handling in containers
> --------------------------------------------------------------------------------
>
>                 Key: HADOOP-8096
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8096
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: util
>    Affects Versions: 0.24.0
>            Reporter: Steve Loughran
>             Fix For: 0.24.0
>
>
> with plans for OSGI integration afoot in HADOOP-7977, Hadoop needs unified place where
System.exit() calls. When one runs any bit of Hadoop in a containers the container will block
those exits with a security manager and convert the calls into security exceptions. A single
exit method would enable such exceptions to be logged, and conceivably handled slightly more
gracefully (e.g. tell the daemon to die).

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