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https://issues.apache.org/jira/browse/HDFS-3970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13544267#comment-13544267
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Todd Lipcon commented on HDFS-3970:
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thanks for the test, Andrew. +1 pending Jenkins
> BlockPoolSliceStorage#doRollback(..) should use BlockPoolSliceStorage instead
> of DataStorage to read prev version file.
> -----------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-3970
> URL: https://issues.apache.org/jira/browse/HDFS-3970
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode
> Affects Versions: 3.0.0, 2.0.2-alpha
> Reporter: Vinay
> Assignee: Vinay
> Attachments: hdfs-3970-1.patch, HDFS-3970.patch
>
>
> {code} // read attributes out of the VERSION file of previous directory
> DataStorage prevInfo = new DataStorage();
> prevInfo.readPreviousVersionProperties(bpSd);{code}
> In the above code snippet BlockPoolSliceStorage instance should be used.
> other wise rollback results in 'storageType' property missing which will not
> be there in initial VERSION file.
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