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From "liang xie (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-7495) parallel scanner seek in StoreScanner's constructor
Date Wed, 23 Jan 2013 12:32:13 GMT

     [ https://issues.apache.org/jira/browse/HBASE-7495?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

liang xie updated HBASE-7495:
-----------------------------

    Status: Patch Available  (was: Open)
    
> parallel scanner seek in StoreScanner's constructor
> ---------------------------------------------------
>
>                 Key: HBASE-7495
>                 URL: https://issues.apache.org/jira/browse/HBASE-7495
>             Project: HBase
>          Issue Type: Bug
>          Components: Scanners
>    Affects Versions: 0.94.3, 0.96.0
>            Reporter: liang xie
>            Assignee: liang xie
>         Attachments: HBASE-7495.txt, HBASE-7495.txt
>
>
> seems there's a potential improvable space before doing scanner.next:
> {code:title=StoreScanner.java|borderStyle=solid}
>     if (explicitColumnQuery && lazySeekEnabledGlobally) {
>       for (KeyValueScanner scanner : scanners) {
>         scanner.requestSeek(matcher.getStartKey(), false, true);
>       }
>     } else {
>       for (KeyValueScanner scanner : scanners) {
>         scanner.seek(matcher.getStartKey());
>       }
>     }
> {code} 
> we can do scanner.requestSeek or scanner.seek in parallel, instead of current serialization,
to reduce latency for special case.
> Any ideas on it ?  I'll have a try if the comments/suggestions are positive:)

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