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https://issues.apache.org/jira/browse/HDFS-5526?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13827055#comment-13827055
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Kihwal Lee commented on HDFS-5526:
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bq. Would storageID and cTime be preserved?
I think so. The slight difficulty is at loading current/VERSION without blowing
up. After reading in, it needs to override a couple of fields and call
writeProperties().
bq. BTW, do you know why cTime=0 in my test case above?
DataStorage's cTime is set to 0 when the node is formatted, but that of
BlockPoolSliceStorage is supposed to be set to the one from nsInfo. So my guess
is, when NNStorage is formatted cTime is 0. NNStorage.newNamespaceInfo() is
setting it to 0 and this must be used for formatting.
> Datanode cannot roll back to previous layout version
> ----------------------------------------------------
>
> Key: HDFS-5526
> URL: https://issues.apache.org/jira/browse/HDFS-5526
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Kihwal Lee
> Priority: Blocker
> Attachments: HDFS-5526.patch
>
>
> Current trunk layout version is -48.
> Hadoop v2.2.0 layout version is -47.
> If a cluster is upgraded from v2.2.0 (-47) to trunk (-48), the datanodes
> cannot start with -rollback. It will fail with IncorrectVersionException.
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