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Date: Wed, 15 Aug 2012 06:43:38 +1100 (NCT)
From: "Colin Patrick McCabe (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Updated] (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:all-tabpanel ]

Colin Patrick McCabe updated HDFS-3731:
---------------------------------------

    Description: 
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.

  was:
Release 2.0 upgrades must handle blocks being written to (bbw) files from 1.0 release. Problem reported by Brahma Reddy.


> 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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