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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9318) when exiting on a signal, print the signal name first
Date Wed, 13 Mar 2013 04:18:12 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9318?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13600796#comment-13600796
] 

Suresh Srinivas commented on HADOOP-9318:
-----------------------------------------

Aaron, thanks for checking.

bq. Each instance of Handler handles a different signal. Keep in mind that prevHandler will
be different for each signal, so if we combined them all into one, we'd have to have some
kind of Map or something to be able to call the correct prevHandler. So I think it's easier
to leave them separate.
Perhaps I do not understand the code correctly. Given that all a handler is doing is just
printing a log, using a single instance of handler should be sufficient and need for separate
instance does not seem necessary, unless different actions need to be taken for each signal.
Again, this is not a big deal.

                
> when exiting on a signal, print the signal name first
> -----------------------------------------------------
>
>                 Key: HADOOP-9318
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9318
>             Project: Hadoop Common
>          Issue Type: Improvement
>    Affects Versions: 2.0.5-beta
>            Reporter: Colin Patrick McCabe
>            Assignee: Colin Patrick McCabe
>            Priority: Minor
>         Attachments: HADOOP-9318.001.patch, HADOOP-9318.002.patch, HADOOP-9318.003.patch
>
>
> On UNIX, it would be nice to know when a Hadoop daemon had exited on a signal.  For example,
if a daemon exited because the system administrator sent SIGTERM (i.e. {{killall java}}),
it would be nice to know that.  Although some of this can be deduced from context and {{SHUTDOWN_MSG}},
it would be nice to have it be explicit.

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