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https://issues.apache.org/jira/browse/HBASE-10204?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13852364#comment-13852364
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Andrew Purtell commented on HBASE-10204:
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This part sounds like overlap: "or reading from dfsclient into DBBs which are
then put into an offheap block cache". And/or getting DBBs wrapped around
mlocked regions of HDFS blocks out of the new DataNode caching layer.
> Offheap efforts
> ---------------
>
> Key: HBASE-10204
> URL: https://issues.apache.org/jira/browse/HBASE-10204
> Project: HBase
> Issue Type: Umbrella
> Reporter: stack
>
> This is an umbrella issue under which we tie all efforts at offheaping
> whether [~apurtell] and crews' effort at single off-heap allocation arena for
> blockcache and memstore through @nkeywal reading queries into direct
> bytebuffers or reading from dfsclient into DBBs which are then put into an
> offheap block cache.
> This issue should include links to discussion and design. It also should
> host targets such as that posited by [~vrodionov] in HBASE-10191 where going
> end-to-end offheap would imply a new read/write pipeline.
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