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https://issues.apache.org/jira/browse/HDFS-4923?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14736301#comment-14736301
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Surendra Singh Lilhore commented on HDFS-4923:
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I think this is implemented in HDFS-6353.
> Save namespace when the namenode is stopped
> -------------------------------------------
>
> Key: HDFS-4923
> URL: https://issues.apache.org/jira/browse/HDFS-4923
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Affects Versions: 3.0.0
> Reporter: Suresh Srinivas
> Assignee: Suresh Srinivas
>
> In rare instances the namenode fails to load editlog due to corruption during
> startup. This has more severe impact if editlog segment to be checkpointed
> has corruption, as checkpointing fails because the editlog with corruption
> cannot be consumed. If an administrator does not notice this and address it
> by saving the namespace, recovering the namespace would involve complex file
> editing, using previous backups or losing last set of modifications.
> The other issue that also happens frequently is, checkpointing fails and has
> not happened for a long time, resulting in long editlogs and even corrupt
> editlogs.
> To handle these issues, when namenode is stopped, we can put it in safemode
> and save the namespace, before the process is shutdown. As an added benefit,
> the namenode restart would be faster, given there is no editlog to consume.
> What do folks think?
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