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From "Vladimir Rodionov (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-9769) Improve performance of a Scanner with explicit column list when rows are small/medium size
Date Sat, 19 Oct 2013 00:25:43 GMT

     [ https://issues.apache.org/jira/browse/HBASE-9769?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vladimir Rodionov updated HBASE-9769:
-------------------------------------

    Release Note: 
The feature allows to improve performance of scan operations when table rows are small/medium
size and scan operation contains explicit set of column:qualifiers to filter on. By default,
the feature is disabled. To enable it set Scan.HINT_NARROW_ROWS attribute of Scan object instance:
Scan scan = ...
scan.setAttribute(Scan.HINT_NARROW_ROWS, Bytes.toBytes(Boolean.TRUE));

The performance improvement depends on a average row size. The smaller rows are - the larger
performance improvement is.  

  was:
The feature allows to improve performance of scan operations when table rows are small/medium
size and scan operation contains explicit set of column:qualifiers to filter on. By default,
the feature is disabled. To enable it set Scan.HINT_NARROW_ROWS attribute of Scan object instance:
Scan scan = ...
scan.setAttribute(Scan.HINT_NARROW_ROWS, "true".getBytes());

The performance improvement depends on a average row size. The smaller rows are - the larger
performance improvement is.  


> Improve performance of a Scanner with explicit column list when rows are small/medium
size
> ------------------------------------------------------------------------------------------
>
>                 Key: HBASE-9769
>                 URL: https://issues.apache.org/jira/browse/HBASE-9769
>             Project: HBase
>          Issue Type: Improvement
>          Components: Scanners
>    Affects Versions: 0.98.0, 0.94.12, 0.96.0
>            Reporter: Vladimir Rodionov
>            Assignee: Vladimir Rodionov
>         Attachments: 9769-0.94-sample1.txt, 9769-0.94-sample2.txt, 9769-0.94-sample.txt,
9769-94.txt, 9769-94-v2.txt, 9769-trunk-v1.txt, 9769-trunk-v2.txt, 9769-trunk-v3.txt, 9769-trunk-v4.txt
>
>




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