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Posted to mapreduce-issues@hadoop.apache.org by "Ramkumar Vadali (JIRA)" <ji...@apache.org> on 2010/07/01 00:58:49 UTC

[jira] Updated: (MAPREDUCE-1816) HAR files used for RAID parity need to have configurable partfile size

     [ https://issues.apache.org/jira/browse/MAPREDUCE-1816?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ramkumar Vadali updated MAPREDUCE-1816:
---------------------------------------

    Attachment: MAPREDUCE-1816.patch.1

Fixed unnecessary whitespace changes in README

> 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, 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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