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Date: Thu, 21 Mar 2013 04:45:40 +0000 (UTC)
From: "Liang Xie (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Message-ID: <JIRA.12632324.1360820656983.24912.1363841140705@arcas>
In-Reply-To: <JIRA.12632324.1360820656983@arcas>
References: <JIRA.12632324.1360820656983@arcas>
Subject: [jira] [Commented] (HBASE-7845) optimize hfile index key
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    [ https://issues.apache.org/jira/browse/HBASE-7845?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13608631#comment-13608631 ] 

Liang Xie commented on HBASE-7845:
----------------------------------

[~jmspaggi], thanks for your help.
I just appended "-Xmx4096m -Xms4096m" to hbase-env.sh, then start hbase instance, then ran "bin/hbase org.apache.hadoop.hbase.HFilePerformanceEvaluation" one by one.
Because it'll check file exist and delete/recreate file in each run, so seems to me it didn't need to restart hbase server between each run.
                
> optimize hfile index key
> ------------------------
>
>                 Key: HBASE-7845
>                 URL: https://issues.apache.org/jira/browse/HBASE-7845
>             Project: HBase
>          Issue Type: Improvement
>          Components: HFile
>    Affects Versions: 0.96.0
>            Reporter: Liang Xie
>            Assignee: Liang Xie
>             Fix For: 0.98.0
>
>         Attachments: HBASE-7845.txt, HBASE-7845-v2.txt, HBASE-7845-v3.txt, HBASE-7845-v4.txt, HBASE-7845-v5.txt, HBASE-7845-v6.txt, HBASE-7845-v7.txt, HBASE-7845-v8.txt
>
>
> Leveldb uses ByteWiseComparatorImpl::FindShortestSeparator() & FindShortSuccessor() to reduce index key size, it would be helpful under special conditions.

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