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https://issues.apache.org/jira/browse/HBASE-12295?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14564184#comment-14564184
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Anoop Sam John commented on HBASE-12295:
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bq.So, as is, we'll make a copy per registered CP?
Not really. We will make copy once. Basically the scan/get we have
distiguished as 2 path. One in which there is no need for copy and other needs
copy. The second case uses the old API itself. Here once we get the cells, we
will see whether it is marked using the new Interface, if so we will do copy to
a new Cell. And then this new cell is going to be passed to CPs as well as HRS
and above layers. Am I making it clear now?
> Prevent block eviction under us if reads are in progress from the BBs
> ---------------------------------------------------------------------
>
> Key: HBASE-12295
> URL: https://issues.apache.org/jira/browse/HBASE-12295
> Project: HBase
> Issue Type: Sub-task
> Components: regionserver, Scanners
> Reporter: ramkrishna.s.vasudevan
> Assignee: ramkrishna.s.vasudevan
> Fix For: 2.0.0
>
> Attachments: HBASE-12295.pdf, HBASE-12295_trunk.patch
>
>
> While we try to serve the reads from the BBs directly from the block cache,
> we need to ensure that the blocks does not get evicted under us while
> reading. This JIRA is to discuss and implement a strategy for the same.
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