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https://issues.apache.org/jira/browse/HDFS-5526?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kihwal Lee updated HDFS-5526:
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Attachment: HDFS-5526.patch
The new patch fixes the rollback function of {{DataStorage}}. TestDFSRollback
is modified to reproduce the issue reported in this jira. Without the fix, the
test fails. The patch adds a method to read in VERSION except {{layoutVersion}}
in order to bypass the check enforced by {{Storage.setLayoutVersion()}}. This
method is used to read in and write back other properties such as {{clusterID}}
and {{StorageID}} with the rolled back layout version.
In {{doUpgrade()}}, overriding of {{clusterID}} is removed. It has no effect,
because the stored cluster ID is checked against the one provided by name node
before {{doUpgrade()}} is called.
> 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, 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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