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From "Rodrigo Schmidt (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1816) HAR files used for RAID parity need to have configurable partfile size
Date Thu, 30 Sep 2010 01:51:33 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1816?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12916342#action_12916342
] 

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

Do I need to +1 again? :)

+1

> 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
>            Assignee: Ramkumar Vadali
>            Priority: Minor
>             Fix For: 0.22.0
>
>         Attachments: MAPREDUCE-1816.patch, MAPREDUCE-1816.patch.1
>
>
> 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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