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Posted to common-dev@hadoop.apache.org by "Steve Loughran (JIRA)" <ji...@apache.org> on 2009/05/20 18:22:45 UTC

[jira] Commented: (HADOOP-3648) improve singleton handling in DataNode

    [ https://issues.apache.org/jira/browse/HADOOP-3648?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12711209#action_12711209 ] 

Steve Loughran commented on HADOOP-3648:
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in SVN_HEAD, The FileChecksumServlets also assume that getDataNode() returns their datanode; that is information that should be passed to the servlet as a parameter when setting up the servlet context.

> improve singleton handling in DataNode
> --------------------------------------
>
>                 Key: HADOOP-3648
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3648
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: dfs
>    Affects Versions: 0.20.0
>            Reporter: Steve Loughran
>            Priority: Minor
>
> when a DataNode is constructed, it saves its identity to a static field:
> datanodeObject=this;
> 1. there's no check on what if this is already set
> 2. when the datanode terminates, it may want to set this to null

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