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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-270) DFS Upgrade should process dfs.data.dirs in parallel
Date Tue, 08 Feb 2011 21:52:57 GMT

    [ https://issues.apache.org/jira/browse/HDFS-270?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12992200#comment-12992200
] 

Hairong Kuang commented on HDFS-270:
------------------------------------

Since I have not heard from Matt, let me assign this to me. This is very important to us since
we have 12-disk nodes and need to do an upgrade in a near future.

> DFS Upgrade should process dfs.data.dirs in parallel
> ----------------------------------------------------
>
>                 Key: HDFS-270
>                 URL: https://issues.apache.org/jira/browse/HDFS-270
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: data-node
>    Affects Versions: 0.20.2
>            Reporter: Stu Hood
>            Assignee: Matt Foley
>
> I just upgraded from 0.14.2 to 0.15.0, and things went very smoothly, if a little slowly.
> The main reason the upgrade took so long was the block upgrades on the datanodes. Each
of our datanodes has 3 drives listed for the dfs.data.dir parameter. From looking at the logs,
it is fairly clear that the upgrade procedure does not attempt to upgrade all listed dfs.data.dir's
in parallel.
> I think even if all of your dfs.data.dir's are on the same physical device, there would
still be an advantage to performing the upgrade process in parallel. The less downtime, the
better: especially if it is potentially 20 minutes versus 60 minutes.

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