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https://issues.apache.org/jira/browse/HDFS-11288?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15796435#comment-15796435
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Esteban Gutierrez commented on HDFS-11288:
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I think the safe mode semantic shouldn't be changed, probably the easiest
approach is to have something like a single user (or admin group) switch for
that matter.
> Manually allow block replication/deletion in Safe Mode
> ------------------------------------------------------
>
> Key: HDFS-11288
> URL: https://issues.apache.org/jira/browse/HDFS-11288
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: namenode
> Affects Versions: 3.0.0-alpha1
> Reporter: Lukas Majercak
>
> Currently, the Safe Mode does not allow block replication/deletion, which
> makes sense, especially on startup, as we do not want to replicate blocks
> unnecessarily.
> An issue we have seen in our clusters though, is when the NameNode is getting
> overwhelmed with the amounts of needed replications; in which case, we would
> like to be able to manually set the NN to be in a state in which R/Ws to FS
> are disallowed but the NN continues replicating/deleting blocks.
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