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https://issues.apache.org/jira/browse/HDFS-3731?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13425517#comment-13425517
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Uma Maheswara Rao G commented on HDFS-3731:
-------------------------------------------

{quote}
sd.root/previous >>> sd.root/current/BPID/current/finalized
sd.root/blocksbeingwritten >>> sd.root/current/BPID/current/rbw
{quote}
Sounds good to me for Hadoop-2 upgrade. Here we have wrapped all the folders 
inside current. That gave some advantage here for not changing any code in 
older versions.

Other point what I considered is, 
If I am running the version with 20.203 and wanted to upgrade to hadoop-1.
In this case, still we will have the problem right? Because we are handling 
blocksBeingWritten as separate folder than current in 20.x versions.
If you agree, may be we can file separate JIRA for that, as this JIRA mainly 
talking about 2.0 upgrade from 1.0.








                
> 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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