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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-13370) PE tool could give option for using Explicit Column Tracker which leads to seeks
Date Mon, 06 Apr 2015 05:29:12 GMT

    [ https://issues.apache.org/jira/browse/HBASE-13370?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14480946#comment-14480946

ramkrishna.s.vasudevan commented on HBASE-13370:

Just seeing this latest comment,
Your PE has 10 columns? So is that a modified version of the PE? Because by default when we
do sequentialWrite it writes data with one Column.
So am not sure what is your scan1000 doing.  Is it again customised?  RandomScanWithRange10000Test
by default adds a the default family and qualifier explicitly thus every time leading to additional
seek due to the explicit column tracker. This change would help you in making that addColumn
configurable thus reducing one more seek.  

> PE tool could give option for using Explicit Column Tracker which leads to seeks
> --------------------------------------------------------------------------------
>                 Key: HBASE-13370
>                 URL: https://issues.apache.org/jira/browse/HBASE-13370
>             Project: HBase
>          Issue Type: Improvement
>    Affects Versions: 1.0.0, 1.0.1
>            Reporter: ramkrishna.s.vasudevan
>            Assignee: ramkrishna.s.vasudevan
>         Attachments: HBASE-13370.patch, HBASE-13370_1.patch, HBASE-13370_1.patch
> Currently in PE tool all the scans and gets adds explicitly the columns to be scanned.
 The tool by default adds only one Qualifier.  Doing this addColumns leads to Explicit Column
Tracker which does seeks frequently. If we want to know a simple scan performance as a basic
scenario then we should have the option to add this columns explicitly.

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