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https://issues.apache.org/jira/browse/HDFS-4694?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jing Zhao updated HDFS-4694:
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Attachment: HDFS-4694.002.patch
Update the patch: fix the inode id for root.
> The SecondaryNameNode may change the inode id of root while doing checkpoint
> ----------------------------------------------------------------------------
>
> Key: HDFS-4694
> URL: https://issues.apache.org/jira/browse/HDFS-4694
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Affects Versions: 3.0.0
> Reporter: Jing Zhao
> Assignee: Jing Zhao
> Attachments: HDFS-4694.001.patch, HDFS-4694.002.patch
>
>
> SNN will call FSNamesystem#clear while merging the fsimage to its local
> FSNamesystem, and the FSDirectory will be reset in this process. However, in
> FSDirectory#reset, a new inode id will be allocated and assigned to the new
> root.
> To fix the problem, we can either pass in an inode id in
> FSDirectory#createRoot, or update the root id in FSImageFormat#updateRootAttr.
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