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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3808) fuse_dfs: postpone libhdfs intialization until after fork
Date Thu, 16 Aug 2012 18:25:38 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3808?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13436193#comment-13436193

Aaron T. Myers commented on HDFS-3808:

Thanks a lot for reviewing the patch, Andy.

Colin, can you also comment on what testing you've done of this change?
> 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
> {{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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