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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-1435) Provide an option to store fsimage compressed
Date Thu, 30 Sep 2010 23:57:32 GMT
Provide an option to store fsimage compressed

                 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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