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https://issues.apache.org/jira/browse/HBASE-12295?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14627586#comment-14627586
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Anoop Sam John commented on HBASE-12295:
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Just adding to what Ram said abt diff Cell impl
Write path
-----------
KeyValue and NoTagsKeyValue
Read path
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SizeCachedKeyValue, SizeCachedNoTagsKeyValue
OffheapCell, OffheapNoTagsCell (this will be having size cached and it will be
extending ByteBufferedCell and also will be marked as Shared memory using the
new interface)
DBE was/is having an impl already (ClonedSeekerState) We will add one more
counterpart for this which will be offheap backed - We need a rename.
ClonedSeekerState does not look like a Cell at all
Prefix tree was/is having an impl already (ClonedPrefixCell) - We will add one
more counterpart for this which will be offheap backed - We need a rename?
also read path will have KeyOnlyKeyValue stuff as well as the FakeCell impls
for FirstOnROw, LastOnRow etc.
> 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_1.patch, HBASE-12295_1.pdf,
> HBASE-12295_10.patch, HBASE-12295_12.patch, HBASE-12295_2.patch,
> HBASE-12295_4.patch, HBASE-12295_4.pdf, HBASE-12295_5.pdf,
> HBASE-12295_9.patch, 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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