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https://issues.apache.org/jira/browse/HDFS-1061?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12849244#action_12849244
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Tsz Wo (Nicholas), SZE commented on HDFS-1061:
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We probably could safely assume that preferredBlockSize is a power of 2. In
such case, only the exponents need be stored. A 6-bit integer is good enough.
> Memory footprint optimization for INodeFile object.
> ----------------------------------------------------
>
> Key: HDFS-1061
> URL: https://issues.apache.org/jira/browse/HDFS-1061
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: name-node
> Affects Versions: 0.22.0
> Reporter: Bharath Mundlapudi
> Priority: Minor
> Fix For: 0.22.0
>
>
> I am proposing a footprint optimization to merge blockReplication and
> preferredBlockSize fields into one 'long header' field in INodeFile class.
> This saves 8 bytes per INodeFile object on a 64 bit JVM. This memory
> optimization is transparent and changes are very minimal.
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