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Posted to notifications@accumulo.apache.org by "Josh Elser (JIRA)" <ji...@apache.org> on 2013/07/12 03:22:46 UTC

[jira] [Created] (ACCUMULO-1566) Add ability for client to start Scanner readahead immediately

Josh Elser created ACCUMULO-1566:
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             Summary: 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
             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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