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From "Amitanand Aiyer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4346) Optimise the storage that we use for storing MVCC information.
Date Wed, 07 Sep 2011 19:01:09 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4346?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13099215#comment-13099215

Amitanand Aiyer commented on HBASE-4346:

This task is a nice-to-have. Not really required for addressing the "correctness" issue with

Will work on this as the next step. Putting a place holder here.

> Optimise the storage that we use for storing MVCC information.
> --------------------------------------------------------------
>                 Key: HBASE-4346
>                 URL: https://issues.apache.org/jira/browse/HBASE-4346
>             Project: HBase
>          Issue Type: Sub-task
>         Environment: Writing the memstoreTS information is critical to ensuring Atomic
semantics. However, it adds a storage overhead to the disk files. 
> This information is useful only when there is a "concurrent" read operation that needs
to ignore a particular key-value. 
> Once it is known that a key-value is going to be included in all current and future read
operations, MVCC memstoreTS information is
> of no use anymore. 
> We can optimize for storage on disk, by getting rid of these values during later compactions.

>            Reporter: Amitanand Aiyer
>            Priority: Minor
>             Fix For: 0.94.0

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