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Date: Fri, 31 Aug 2012 15:03:09 +1100 (NCT)
From: "Eli Collins (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Assigned] (HDFS-2896) The 2NN incorrectly daemonizes
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     [ https://issues.apache.org/jira/browse/HDFS-2896?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eli Collins reassigned HDFS-2896:
---------------------------------

    Assignee:     (was: Eli Collins)
    
> The 2NN incorrectly daemonizes
> ------------------------------
>
>                 Key: HDFS-2896
>                 URL: https://issues.apache.org/jira/browse/HDFS-2896
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: name-node
>    Affects Versions: 0.23.0, 0.24.0
>            Reporter: Eli Collins
>              Labels: newbie
>
> The SecondaryNameNode (and Checkpointer) confuse o.a.h.u.Daemon with a Unix daemon. Per below it intends to create a thread that never ends, but o.a.h.u.Daemon just marks a thread with Java's Thread#setDaemon which means Java will terminate the thread when there are no more non-daemon user threads running
> {code}
>     // Create a never ending deamon
>     Daemon checkpointThread = new Daemon(secondary);
> {code}
> Perhaps they thought they were using commons Daemon. We of course don't want the 2NN to exit unless it exits itself or is stopped explicitly. Currently it won't do this because the main thread is not marked as a daemon thread. In any case, let's make the 2NN consistent with the NN in this regard (exit when the RPC thread exits).

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