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Date: Mon, 6 Jul 2015 23:41:06 +0000 (UTC)
From: "Vladimir Rodionov (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Message-ID: <JIRA.12837250.1434060349000.112449.1436226066640@Atlassian.JIRA>
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 <JIRA.12837250.1434060349983@arcas>
Subject: [jira] [Commented] (HBASE-13890) Get/Scan from MemStore only
 (Client API)
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    [ https://issues.apache.org/jira/browse/HBASE-13890?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14615905#comment-14615905 ] 

Vladimir Rodionov commented on HBASE-13890:
-------------------------------------------

The new API contract is the following:

* No guarantee on a data (if it is not in MemStore - nothing you get)
* Data can be partial
* Always check a result of an operation - call regular operation if result is empty or partial. 

> 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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