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Date: Wed, 26 May 2010 02:38:35 -0400 (EDT)
From: "Rodrigo Schmidt (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
Subject: [jira] Commented: (MAPREDUCE-1816) HAR files used for RAID parity
 need to have configurable partfile size
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-1816?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12871531#action_12871531 ] 

Rodrigo Schmidt commented on MAPREDUCE-1816:
--------------------------------------------

Hi Ram,

Your patch is changing spaces and tabs which makes it hard to check. Please change it.
You need some unit tests as well.

Thanks for working on this!

> HAR files used for RAID parity need to have configurable partfile size
> ----------------------------------------------------------------------
>
>                 Key: MAPREDUCE-1816
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1816
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: contrib/raid
>    Affects Versions: 0.20.1
>            Reporter: Ramkumar Vadali
>            Priority: Minor
>         Attachments: MAPREDUCE-1816.patch
>
>
> RAID parity files are merged into HAR archives periodically. This is required to reduce the number of files that the NameNode has to track. The number of files present in a HAR archive depends on the size of HAR part files - higher the size, lower the number of files.
> The size of HAR part files is configurable through the setting har.partfile.size, but that is a global setting. This task introduces a new setting specific to raid.har.partfile.size, that is used in-turn to set har.partfile.size

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