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From "Eli Collins (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1120) Make DataNode's block-to-device placement policy pluggable
Date Fri, 30 Apr 2010 17:41:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1120?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12862762#action_12862762
] 

Eli Collins commented on HDFS-1120:
-----------------------------------

This is the result of discussion on in the "dfs.data.dir" thread on general. The high-level
bit is that disk utilization gets imbalanced so you get effectively fewer spindles for writes
since some disks will will up much faster than others. Do you see this in your clusters?

> Make DataNode's block-to-device placement policy pluggable
> ----------------------------------------------------------
>
>                 Key: HDFS-1120
>                 URL: https://issues.apache.org/jira/browse/HDFS-1120
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: data-node
>            Reporter: Jeff Hammerbacher
>
> As discussed on the mailing list, as the number of disk drives per server increases,
it would be useful to allow the DataNode's policy for new block placement to grow in sophistication
from the current round-robin strategy.

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