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From "Bryan Duxbury (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-430) Performance: Scanners and getRow return maps with duplicate data
Date Fri, 07 Mar 2008 22:07:48 GMT

    [ https://issues.apache.org/jira/browse/HBASE-430?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12576397#action_12576397
] 

Bryan Duxbury commented on HBASE-430:
-------------------------------------

I'm thinking we could add a class called RowResult, which has a Text row and HBaseMapWritable<Text,
Cell> columns. This itself can be a writable. 

Then, when you call scanner.next, you can just return a single record from the method instead
of a bool + modify parameters. If it's null, there's nothing more left.

> Performance: Scanners and getRow return maps with duplicate data
> ----------------------------------------------------------------
>
>                 Key: HBASE-430
>                 URL: https://issues.apache.org/jira/browse/HBASE-430
>             Project: Hadoop HBase
>          Issue Type: Improvement
>            Reporter: Bryan Duxbury
>            Priority: Minor
>
> Right now, whenever we get back multiple cells worth of data at a time, we do so in a
map of HStoreKey->byte[]. This means that there is a duplicated Text row and long timestamp
at the very least between every cell. This is quite a bit wasted. It also means we have to
do a lot of translation every time. 
> We could create a new Writable that contains just one row, one timestamp, and a map of
Text->byte[].

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