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https://issues.apache.org/jira/browse/HADOOP-2413?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12666751#action_12666751
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Konstantin Shvachko commented on HADOOP-2413:
---------------------------------------------
You probably want to deprecate the {{static fsNamesystemObject}} member
somewhere along the lines.
> Is FSNamesystem.fsNamesystemObject unique?
> ------------------------------------------
>
> Key: HADOOP-2413
> URL: https://issues.apache.org/jira/browse/HADOOP-2413
> Project: Hadoop Core
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.15.1
> Reporter: Tsz Wo (Nicholas), SZE
> Priority: Minor
>
> FSNamesystem is unique in almost all cases but it is not universally true.
> So we should either remove the static variable
> FSNamesystem.fsNamesystemObject or make it final (so that it cannot be
> overwritten).
> When I am working on HADOOP-1298, I use the convenient static method
> FSNamesystem.getFSNamesystem() to get "the" FSNamesystem object. However, it
> keeps failing on TestCheckpoint. Why? It is because TestCheckpoint uses
> NameNode and SecondaryNameNode. Both of them are creating FSNamesystem. So
> FSNamesystem.fsNamesystemObject does not remain constant. The kind of bug is
> hard to be detected.
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