Namesystem metrics are collected before namesystem is fully initialized
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Key: HDFS-1042
URL: https://issues.apache.org/jira/browse/HDFS-1042
Project: Hadoop HDFS
Issue Type: Bug
Components: name-node
Affects Versions: 0.20.2, 0.21.0, 0.22.0
Reporter: Todd Lipcon
FSNamesystem leaks its reference out to the metrics system before it has
initialized FSDirectory. Therefore in rare occasions you can get NPEs when
metrics try to collect data from FSN before it's initialized.
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