NameNode should save image to name directories in parallel during upgrade
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Key: HDFS-1826
URL: https://issues.apache.org/jira/browse/HDFS-1826
Project: Hadoop HDFS
Issue Type: Improvement
Components: name-node
Affects Versions: 0.23.0
Reporter: Hairong Kuang
Currently namenode saves a new image to all its name directories in sequence
during upgrade. We should make it to do in parallel to speedup namenode
upgrade. Also it should not save its image to edits directories.
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