You are viewing a plain text version of this content. The canonical link for it is here.

Posted to common-dev@hadoop.apache.org by "stack (JIRA)" <ji...@apache.org> on 2007/12/23 00:49:43 UTC

[jira] Assigned: (HADOOP-2485) [hbase] Make mapfile index interval configurable

     [ https://issues.apache.org/jira/browse/HADOOP-2485?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

stack reassigned HADOOP-2485:
-----------------------------

    Assignee: stack

> [hbase] Make mapfile index interval configurable
> ------------------------------------------------
>
>                 Key: HADOOP-2485
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2485
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: contrib/hbase
>            Reporter: stack
>            Assignee: stack
>            Priority: Minor
>             Fix For: 0.16.0
>
>         Attachments: index.patch
>
>
> Default mapfile index interval is every 128 entries.  Basic tests show PerformanceEvaluation mapfile test random reading 100k records in 60plus seconds.  If index interval is set to 1 so we don't have to next around looking for our record, then 100k random reads take 7 seconds.  This is using local filesystem.  If I set it to 16, then takes 12 seconds. 
> Testing doing PerformanceEvaluation random reads against hbase, with interval set to 16, we run 50% faster (hdfs is in the picture).

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.