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https://issues.apache.org/jira/browse/HADOOP-3648?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12608445#action_12608445
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Steve Loughran commented on HADOOP-3648:
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there are a couple of places in the code that assume that
Datanode.getDatanode() returns non-null, both associated with dereferencing the
upgrade manager.
> 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: 0.19.0
> 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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