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From "Johan Oskarson (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-296) Do not assign blocks to a datanode with < x mb free
Date Tue, 13 Jun 2006 11:13:30 GMT
     [ http://issues.apache.org/jira/browse/HADOOP-296?page=all ]

Johan Oskarson updated HADOOP-296:

    Attachment: minspace.patch

This is a completely untested patch, in fact it's more of an indication of what I mean with
this feature request.
(I don't have the time nor the setup to test this right now)
Just thought I'd get this submitted before I forget

> Do not assign blocks to a datanode with < x mb free
> ---------------------------------------------------
>          Key: HADOOP-296
>          URL: http://issues.apache.org/jira/browse/HADOOP-296
>      Project: Hadoop
>         Type: New Feature

>   Components: dfs
>     Versions: 0.3.2
>     Reporter: Johan Oskarson
>  Attachments: minspace.patch
> We're running a smallish cluster with very different machines, some with only 60 gb harddrives
> This creates a problem when inserting files into the dfs, these machines run out of space
quickly and then they cannot run any map reduce operations
> A solution would be to not assign any new blocks once the space is below a certain user
configurable threshold
> This free space could then be used by the map reduce operations instead (if that's on
the same disk)

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