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From "Raju (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3731) 2.0 release upgrade must handle blocks being written from 1.0
Date Mon, 30 Jul 2012 17:13:35 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3731?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13425015#comment-13425015
] 

Raju commented on HDFS-3731:
----------------------------

In the upgrade process we usually rename the old folder to previous folder but here we have
2 folders (one contain finalised blocks and other in BBW) to handle ,I would like to propose

sd.root/previous >>> sd.root/current/BPID/current/finalized
sd.root/blocksbeingwritten >>> sd.root/current/BPID/current/rbw

NOTE: >>> hardlink
NOTE: blocksbeingwritten folder is not renamed since this can cause rollback problem with
old versions.

With the above fix there are some advantages
1. Simple change in existing code(2.X +) code,
2. No change required for old version code.(1.X -),
3. Rollback will work without any new effort,

Please correct me if I am wrong.
                
> 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: Todd Lipcon
>            Priority: Blocker
>
> Release 2.0 upgrades must handle blocks being written to (bbw) files from 1.0 release.
Problem reported by Brahma Reddy.

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