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https://issues.apache.org/jira/browse/HDFS-9730?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15127845#comment-15127845
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Tsz Wo Nicholas Sze commented on HDFS-9730:
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[~vinayrpet], thanks for hints. I understand the bug now. The bug is that
layout version is updated before createStorageID(..).
> Storage ID update does not happen when there is a layout change
> ---------------------------------------------------------------
>
> Key: HDFS-9730
> URL: https://issues.apache.org/jira/browse/HDFS-9730
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Kihwal Lee
> Assignee: Tsz Wo Nicholas Sze
>
> HDFS-9654 will cause test failures when we increment the datanode layout
> version next time.
> {noformat}
> TestDatanodeStartupFixesLegacyStorageIDs#testUpgradeFrom22via26FixesStorageIDs
> TestDatanodeStartupFixesLegacyStorageIDs#testUpgradeFrom22FixesStorageIDs
> {noformat}
> This is because createStorageID() is no longer called when it goes through
> the layout upgrade path.
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