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Date: Fri, 17 Aug 2012 08:27:38 +1100 (NCT)
From: "Colin Patrick McCabe (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Updated] (HDFS-3808) fuse_dfs: postpone libhdfs
 intialization until after fork
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     [ https://issues.apache.org/jira/browse/HDFS-3808?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Colin Patrick McCabe updated HDFS-3808:
---------------------------------------

    Attachment: HDFS-3808.003.patch

%Z -> %z
                
> fuse_dfs: postpone libhdfs intialization until after fork
> ---------------------------------------------------------
>
>                 Key: HDFS-3808
>                 URL: https://issues.apache.org/jira/browse/HDFS-3808
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: fuse-dfs
>    Affects Versions: 2.2.0-alpha
>            Reporter: Colin Patrick McCabe
>            Assignee: Colin Patrick McCabe
>            Priority: Critical
>         Attachments: HDFS-3808.001.patch, HDFS-3808.002.patch, HDFS-3808.003.patch
>
>
> {{libhdfs}} may create threads or initialize internal JNI data structures when it is used.  So we should be careful to {{daemonize()}} before initializing {{libhdfs}}, not after.
> Unfortunately, fuse_dfs is doing just this -- initializing libhdfs in its {{main}} function, prior to calling {{fuse_main}} which does a {{daemonize}}.
> {{daemonize()}} does not preserve threads, because it is implemented by {{fork()}}ing and then continuing execution in the child and allowing the parent to {{exit()}}.

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