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https://issues.apache.org/jira/browse/HBASE-13890?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14616950#comment-14616950
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Vladimir Rodionov commented on HBASE-13890:
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{quote}
I see.. Checking the patch now. So this will fail it to client.. Can the get op
be repeated (with out memstore only setting) at server side only?
{quote}
Yes, I think it can be improved. I am working on patch #2. I want to clarify
little bit what is this patch is for.
This is mostly to improve high performance counters (HPC), not Get, not Append
(is anybody using them anyway) and not Scan operations. Most recent version of
HPCs are always in Memstore (99.99% of a time), but each store file in this
region/cf has its version as well (before major compaction). When HBase reads
counter it has to go through all store files and compare results - very
inefficient. This patch allows to bypass store files completely most of the
time.
For
> Get/Scan from MemStore only (Client API)
> ----------------------------------------
>
> Key: HBASE-13890
> URL: https://issues.apache.org/jira/browse/HBASE-13890
> Project: HBase
> Issue Type: New Feature
> Components: API, Client, Scanners
> Reporter: Vladimir Rodionov
> Assignee: Vladimir Rodionov
> Attachments: HBASE-13890-v1.patch
>
>
> This is short-circuit read for get/scan when recent data (version) of a cell
> can be found only in MemStore (with very high probability).
> Good examples are: Atomic counters and appends. This feature will allow to
> bypass completely store file scanners and improve performance and latency.
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