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From "Mahadev konar (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3307) Archives in Hadoop.
Date Sun, 27 Apr 2008 20:30:55 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3307?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12592678#action_12592678
] 

Mahadev konar commented on HADOOP-3307:
---------------------------------------

>am also curious about the 'parallel creation' aspect (since that seems to be the main
argument for using a new > achive format). how do we populate a single hdfs file (backing
the archive) in parallel? 

The archive isnt a single file backed by an index but multiple files 

quoting from the design posted earlier in the comments:

The format of an archive as a filesystem path is:

/user/mahadev/foo.har/_index*
/user/mahadev/foo.har/part-*

The indexes store the filenames and the offset with the part files.

Each map would create part-$i files and a single reduce or multiple reduces could create the
index files in the archive directory. Does that help in understanding the design?


> Archives in Hadoop.
> -------------------
>
>                 Key: HADOOP-3307
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3307
>             Project: Hadoop Core
>          Issue Type: New Feature
>          Components: fs
>            Reporter: Mahadev konar
>            Assignee: Mahadev konar
>             Fix For: 0.18.0
>
>
> This is a new feature for archiving and unarchiving files in HDFS. 

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