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https://issues.apache.org/jira/browse/HDFS-15287?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17091923#comment-17091923
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Konstantin Shvachko commented on HDFS-15287:
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Thanks [~kihwal]. It makes sense now. Looks like HDFS-15036 is missing in your
2.10 branch. We committed it after 2.10.0 release. We should probably do a
followup release, as we got it running on production clusters.
You made a good point about the second condition for checkpointing - the
transactions threshold. [~vagarychen] we should incorporate it.
> 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: Blocker
>
> 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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