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https://issues.apache.org/jira/browse/HBASE-12295?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14631844#comment-14631844
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stack commented on HBASE-12295:
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[~anoop.hbase] Anything to cut down on the combinatorial explosion.
bq. In read path we will deal with Cell type and we can add this to Cell
interface.
Server-side only?
"May be we can avoid 2 impls one with out tags and one with. Have a state
(boolean) in Cell impl. We have SizeCachedKeyValue abd SizeCachedNoTagsKeyValue
now. May be we will only have SizeCachedKeyValue and it will have a boolean
state whether it has tags or not. The getTagsLength() can check this state ad
return 0 or decode tags length. We have extra 6 bytes per cell in this
SizeCachedKeyValue now. Make it 7 is ok IMO"
Above seems fine though just one-byte we should profile; stuff might run better
if padding -- TBD. More ideal would be the case where if no tags, then no cost
but don't know how to do that.
> 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_14.patch,
> HBASE-12295_15.patch, HBASE-12295_16.patch, HBASE-12295_16.patch,
> HBASE-12295_17.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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