Provide an option to store fsimage compressed
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Key: HDFS-1435
URL: https://issues.apache.org/jira/browse/HDFS-1435
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
Our HDFS has fsimage as big as 20G bytes. It consumes a lot of network
bandwidth when secondary NN uploads a new fsimage to primary NN.
If we could store fsimage compressed, the problem could be greatly alleviated.
I plan to provide a new configuration hdfs.image.compressed with a default
value of false. If it is set to be true, fsimage is stored as compressed.
The fsimage will have a new layout with a new field "compressed" in its header,
indicating if the namespace is stored compressed or not.
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