BackupNode is downloading image from NameNode for every checkpoint
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Key: HDFS-2698
URL: https://issues.apache.org/jira/browse/HDFS-2698
Project: Hadoop HDFS
Issue Type: Bug
Components: name-node
Affects Versions: 0.22.0
Reporter: Konstantin Shvachko
Assignee: Konstantin Shvachko
BackupNode can make periodic checkpoints without downloading image and edits
files from the NameNode, but with just saving the namespace to local disks.
This is not happening because NN renews checkpoint time after every checkpoint,
thus making its image ahead of the BN's even though they are in sync.
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