Kihwal Lee created HDFS-6545:
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Summary: Finalizing rolling upgrade can make NN unavailable for a
long duration
Key: HDFS-6545
URL: https://issues.apache.org/jira/browse/HDFS-6545
Project: Hadoop HDFS
Issue Type: Improvement
Affects Versions: 2.4.0
Reporter: Kihwal Lee
Priority: Critical
In {{FSNamesystem#finalizeRollingUpgrade()}}, {{saveNamespace()}} is directly
called. For name nodes with a big name space, it can take minutes to save a
new fsimage.
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