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https://issues.apache.org/jira/browse/HDFS-7836?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14350878#comment-14350878
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Colin Patrick McCabe commented on HDFS-7836:
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I don't think the block map size is really that easy to get at right now.
Taking a heap dump on a big NN can take minutes... it's not something most
sysadmins will let you do. And the analysis is difficult... a lot of common
heap analysis tools require tons of memory.
Anyway, we should probably add a JMX counter for the size(s) of the block map
hash tables, and the number of entries, for tracking purposes.
> BlockManager Scalability Improvements
> -------------------------------------
>
> Key: HDFS-7836
> URL: https://issues.apache.org/jira/browse/HDFS-7836
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Charles Lamb
> Assignee: Charles Lamb
> Attachments: BlockManagerScalabilityImprovementsDesign.pdf
>
>
> Improvements to BlockManager scalability.
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