Is FSNamesystem.fsNamesystemObject unique?
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Key: HADOOP-2413
URL: https://issues.apache.org/jira/browse/HADOOP-2413
Project: Hadoop
Issue Type: Bug
Affects Versions: 0.15.1
Reporter: Tsz Wo (Nicholas), SZE
Priority: Minor
FSNamesystem is unique in almost all cases but it is not be universally true.
So we should either remove the static variable FSNamesystem.fsNamesystemObject
or make it final (so that it cannot be overwritten).
When I working on HADOOP-1298, I use the convenient static method
FSNamesystem.getFSNamesystem() to get "the" FSNamesystem object. However, it
keeps failing TestCheckpoint. Why? It is because TestCheckpoint use NameNode
and SecondaryNameNode. Both of them are creating FSNamesystem. So
FSNamesystem.fsNamesystemObject is not unique.
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