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https://issues.apache.org/jira/browse/HDFS-9730?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15127193#comment-15127193
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Kihwal Lee commented on HDFS-9730:
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bq. I am not quite sure I understand why the current unit tests are actually
passing
The datanode layout version(-56) hasn't changed in trunk or branch-2.7. So the
test won't go through the layout update path. If the test case used an older
layout version, it would have failed. HDFS-7575 was created with the test
resource containing datanode layout version -56.
> 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
>
> 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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