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Date: Thu, 23 Aug 2012 06:06:42 +1100 (NCT)
From: "Eli Collins (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-3731) 2.0 release upgrade must handle
 blocks being written from 1.0
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    [ https://issues.apache.org/jira/browse/HDFS-3731?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13439766#comment-13439766 ] 

Eli Collins commented on HDFS-3731:
-----------------------------------

Great +1.  The code/design makes sense to me and we know the current path is broken and we've verified the fix.  Suresh and Nicholas I'll commit this unless you're going to check it out. 
                
> 2.0 release upgrade must handle blocks being written from 1.0
> -------------------------------------------------------------
>
>                 Key: HDFS-3731
>                 URL: https://issues.apache.org/jira/browse/HDFS-3731
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: data-node
>    Affects Versions: 2.0.0-alpha
>            Reporter: Suresh Srinivas
>            Assignee: Colin Patrick McCabe
>            Priority: Blocker
>         Attachments: HDFS-3731.002.patch, HDFS-3731.003.patch
>
>
> Release 2.0 upgrades must handle blocks being written to (bbw) files from 1.0 release. Problem reported by Brahma Reddy.
> The {{DataNode}} will only have one block pool after upgrading from a 1.x release.  (This is because in the 1.x releases, there were no block pools-- or equivalently, everything was in the same block pool).  During the upgrade, we should hardlink the block files from the {{blocksBeingWritten}} directory into the {{rbw}} directory of this block pool.  Similarly, on {{-finalize}}, we should delete the {{blocksBeingWritten}} directory.

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