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From "ASF subversion and git services (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-1566) Add ability for client to start Scanner readahead immediately
Date Wed, 09 Oct 2013 03:53:47 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-1566?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13789999#comment-13789999
] 

ASF subversion and git services commented on ACCUMULO-1566:
-----------------------------------------------------------

Commit 05b3359b9c6643cbdb2284afead9a0dcac2a9300 in branch refs/heads/master from [~elserj]
[ https://git-wip-us.apache.org/repos/asf?p=accumulo.git;h=05b3359 ]

ACCUMULO-1566 Pass down the readaheadThreshold parameter from the client to the
server so that the same limit is adhered to by the server in regards to
pipelining.

Thanks to Keith for his help here.


> Add ability for client to start Scanner readahead immediately
> -------------------------------------------------------------
>
>                 Key: ACCUMULO-1566
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-1566
>             Project: Accumulo
>          Issue Type: Improvement
>          Components: client
>            Reporter: Josh Elser
>            Assignee: Josh Elser
>             Fix For: 1.6.0
>
>
> When the client cares about getting results in sorted order, the BatchScanner, as nice
as it is, is mostly irrelevant.
> One interesting property of the Scanner is that it will begin to pre-fetch more results
after the 3rd batch of results has been fetched from the server.
> Clients may have an idea of the number of records that will be returned by a scan, and
thus will have an idea about how they want to control such a readahead. It would be nice to
allow the client to control after how many batches the readahead thread starts.



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