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https://issues.apache.org/jira/browse/HDFS-559?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12747615#action_12747615
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Konstantin Shvachko commented on HDFS-559:
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According to my calculations (no compression)
sizeof(BlockInfo) = 72 + 24*replication
This comes out of these
Object header = 16
Three longs in the block = 8*3
INode reference = 8
Array header = 24
Three references for each replica = 24*replication
> Work out the memory consumption of NN artifacts on a compressed pointer JVM
> ---------------------------------------------------------------------------
>
> Key: HDFS-559
> URL: https://issues.apache.org/jira/browse/HDFS-559
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: name-node
> Affects Versions: 0.21.0
> Environment: 64-bit and 32 bit JVMs, Java6u14 and jdk7 betas, with
> -XX compressed oops enabled/disabled
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Priority: Minor
>
> Following up HADOOP-1687, it would be nice to know the size of datatypes in
> under the java16u14 JVM, which offers compressed pointers.
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