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https://issues.apache.org/jira/browse/HDFS-15287?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kihwal Lee resolved HDFS-15287.
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Resolution: Duplicate
> HDFS rollingupgrade prepare never finishes
> ------------------------------------------
>
> Key: HDFS-15287
> URL: https://issues.apache.org/jira/browse/HDFS-15287
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 2.10.0, 3.3.0
> Reporter: Kihwal Lee
> Priority: Major
>
> After HDFS-12979, the prepare step of rolling upgrade does not work. This is
> because it added additional check for sufficient time passing since last
> checkpoint. Since RU rollback image creation and upload can happen any time,
> uploading of rollback image never succeeds. For a new cluster deployed for
> testing, it might work since it never checkpointed before.
> It was found that this check is disabled for unit tests, defeating the very
> purpose of testing.
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