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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-3082) For ICV gets, first look in MemStore before reading StoreFiles
Date Tue, 05 Oct 2010 19:37:32 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3082?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12918132#action_12918132
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Jonathan Gray commented on HBASE-3082:
--------------------------------------

The easy was is to add a flag to get which will first only open the scanner against the memstore/snapshot,
and then if not found, open the scanner again across everything.

The harder way would be to reintroduce the Get code we ripped out (hoping not to do this).

The first way has been implemented by Prakash and we saw big gains from it.

Can you explain more what you mean by mixed puts/ICVs?  Would those be mixed on the same column?

> For ICV gets, first look in MemStore before reading StoreFiles
> --------------------------------------------------------------
>
>                 Key: HBASE-3082
>                 URL: https://issues.apache.org/jira/browse/HBASE-3082
>             Project: HBase
>          Issue Type: Improvement
>          Components: regionserver
>            Reporter: Jonathan Gray
>            Assignee: Prakash Khemani
>
> For incrementColumnValue operations, it is possible to check MemStore for the column
being incremented without sacrificing correctness.  If the column is not found in MemStore,
we would then have to do a normal Get that opens/checks all StoreFiles for the given Store.
> In practice, this makes increment operations significantly faster for recently/frequently
incremented columns.

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