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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12338) Client side scanning prefetching.
Date Fri, 24 Oct 2014 21:42:35 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12338?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14183569#comment-14183569
] 

stack commented on HBASE-12338:
-------------------------------

Yeah, I suppose I'm not clear no how/why I'd use it.  Does it speed up stuff [~daviddengfb]?

> Client side scanning prefetching.
> ---------------------------------
>
>                 Key: HBASE-12338
>                 URL: https://issues.apache.org/jira/browse/HBASE-12338
>             Project: HBase
>          Issue Type: Sub-task
>          Components: Client
>    Affects Versions: 1.0.0, 2.0.0, 0.98.6.1
>            Reporter: Yi Deng
>            Assignee: Yi Deng
>              Labels: prefetch, results, scanner
>         Attachments: 0001-Add-ScanPrefetcher-for-client-side-scanning-prefetch.patch,
0001-ScanPrefetcher.patch
>
>
> Since server side prefetching was not proved to be a good way to prefetch, we need to
do it on client side.
> This is a wrapper class that takes any instance of `ResultScanner` as the underneath
scanning component. The class will schedule the scanning in a background thread. There is
a buffering queue storing prefetched results, whose's length is configurable. The prefetcher
will release the thread if the queue is full and wait for results to be consumed.



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