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