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From "Dinesh S. Atreya (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15273) Advance Hadoop Architecture (AHA) - Advance HBase (Umbrella) JIRA
Date Mon, 15 Feb 2016 15:53:18 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15273?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15147512#comment-15147512
] 

Dinesh S. Atreya commented on HBASE-15273:
------------------------------------------

{panel:title=MVCC Counter based}
Sample is given below for illustration.

|| Data ID || Activity || Data Create Counter	|| Data Expiry Counter || Comments ||
| 1	| Insert	| 40	| MAX_VAL	| Conventionally MAX_VAL is null. 
In order to maintain update size, MAX_VAL is pre-seeded for our purposes. |
| 1	| Delete	| 40	| 47 | Marked as delete when current counter was 47. |
| 2	| Update (old Delete)	| 64	| 78	| Mark old data is DELETE |
| 2	| Update (new insert)	| 78	| MAX_VAL	| Insert new data. |

{panel}

> Advance Hadoop Architecture (AHA) - Advance HBase (Umbrella) JIRA
> -----------------------------------------------------------------
>
>                 Key: HBASE-15273
>                 URL: https://issues.apache.org/jira/browse/HBASE-15273
>             Project: HBase
>          Issue Type: New Feature
>            Reporter: Dinesh S. Atreya
>
> Link to Umbrella JIRA
> https://issues.apache.org/jira/browse/HADOOP-12620
> See https://issues.apache.org/jira/browse/HADOOP-12620?focusedCommentId=15046300&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15046300
for more details.
> This JIRA is an umbrella (parent/master) JIRA for advancing HBase given https://issues.apache.org/jira/browse/HDFS-9607.
> This JIRA contemplates on enhancing HBase to support HBase updates subsequent to https://issues.apache.org/jira/browse/HDFS-9607.
Following benefits are estimated to accrue in the following dimensions with the addition of
HBase updates 
> * Performance and Efficiency  -- HBase updates will have a direct impact on performance
and efficiency by reducing the number of duplicate data since the existing data can be updated.
> * Availability -- Minimize or eliminate Compactions. When compactions are needed to be
done, they can be done in a transparent manner in the background. 
> In addition MVCC capability can be added in due course.



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