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From "Robert Joseph Evans (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-2896) The 2NN incorrectly daemonizes
Date Wed, 18 Apr 2012 20:30:42 GMT

     [ https://issues.apache.org/jira/browse/HDFS-2896?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Robert Joseph Evans updated HDFS-2896:
--------------------------------------

    Target Version/s: 2.0.0, 3.0.0  (was: 0.23.1)
    
> 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
>            Assignee: Eli Collins
>
> 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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