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https://issues.apache.org/jira/browse/HDFS-15624?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17211938#comment-17211938
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Ayush Saxena commented on HDFS-15624:
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I think you would need to handle rolling upgrade-downgrade scenario as well and
bump up the {{NamenodeLayoutVersion?}}
> Fix the SetQuotaByStorageTypeOp problem after updating hadoop
> ---------------------------------------------------------------
>
> Key: HDFS-15624
> URL: https://issues.apache.org/jira/browse/HDFS-15624
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs
> Reporter: YaYun Wang
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> HDFS-15025 adds a new storage Type NVDIMM, changes the ordinal() of the enum
> of StorageType. And, setting the quota by storageType depends on the
> ordinal(), therefore, it may cause the setting of quota to be invalid after
> upgrade.
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