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https://issues.apache.org/jira/browse/HDFS-3731?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13443551#comment-13443551
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Robert Joseph Evans commented on HDFS-3731:
-------------------------------------------
Do you have a list of ones you know about? If not I can start pulling on that
thread tomorrow.
> 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
> Fix For: 2.2.0-alpha
>
> Attachments: hadoop1-bbw.tgz, 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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