[jira] [Commented] (HBASE-6770) Allow scanner setCaching to specify size instead of number of rows

["Lars Hofhansl (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-6770?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13454552#comment-13454552 ] 

Lars Hofhansl commented on HBASE-6770:
--------------------------------------

bq. that would take care of both of these use cases.

Not necessarily. It's still important for a caller to know whether it deals with whole rows or not.
Also some filters won't work when partial rows pass through the scanner.
                
> Allow scanner setCaching to specify size instead of number of rows
> ------------------------------------------------------------------
>
>                 Key: HBASE-6770
>                 URL: https://issues.apache.org/jira/browse/HBASE-6770
>             Project: HBase
>          Issue Type: Bug
>          Components: client, regionserver
>            Reporter: Karthik Ranganathan
>
> Currently, we have the following api's to customize the behavior of scans:
> setCaching() - how many rows to cache on client to speed up scans
> setBatch() - max columns per row to return per row to prevent a very large response.
> Ideally, we should be able to specify a memory buffer size because:
> 1. that would take care of both of these use cases.
> 2. it does not need any knowledge of the size of the rows or cells, as the final thing we are worried about is the available memory.

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