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https://issues.apache.org/jira/browse/HDFS-7836?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14338901#comment-14338901
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Charles Lamb commented on HDFS-7836:
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bq. Are you proposing that off-heaping is an opt-in feature that must be
explicitly enabled in configuration, or are you proposing that off-heaping will
be the new default behavior? Arguably, jumping to off-heaping as the default
could be seen as a backwards-incompatibility, because it might be unsafe to
deploy the feature without simultaneous down-tuning the NameNode max heap size.
Some might see that as backwards-incompatible with existing configurations.
The proposal is to have an option that lets the offheap code allocate slabs
using 'new byte[]' rather than malloc. This would be used for debugging
purposes and not in a normal deployment.
> 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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