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From "Vladimir Rodionov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-13890) Get/Scan from MemStore only (Client API)
Date Tue, 07 Jul 2015 05:51:05 GMT

    [ https://issues.apache.org/jira/browse/HBASE-13890?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14616216#comment-14616216
] 

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

[~anoop.hbase] asked:
{quote}
So if some how the old cell is not there in memstore, the increment op will result in a wrong
result no?
{quote}

No, increment/append will return empty result. Empty result means - operation from memstore
failed, repeat regular one. For counters this will happen very rarely. Its hard to imagine
that a counter is not in a memstore.

> 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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