Improve checkpoint performance by avoiding uncessary image downloads
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Key: HDFS-1458
URL: https://issues.apache.org/jira/browse/HDFS-1458
Project: Hadoop HDFS
Issue Type: Improvement
Components: name-node
Affects Versions: 0.22.0
Reporter: Hairong Kuang
Assignee: Hairong Kuang
Fix For: 0.22.0
If secondary namenode could verify that the image it has on its disk is the
same as the one in the primary NameNode, it could skip downloading the image
from the primary NN, thus completely eliminating the image download overhead.
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