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https://issues.apache.org/jira/browse/HDFS-8716?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14615645#comment-14615645
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Allen Wittenauer commented on HDFS-8716:
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If we are going forward on it, this needs to have in the description that:
a) this is an expert level setting
b) that setting this lower than the min replication is not recommend and/or
dangerous for production setups
> introduce a new config specifically for safe mode block count
> -------------------------------------------------------------
>
> Key: HDFS-8716
> URL: https://issues.apache.org/jira/browse/HDFS-8716
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Chang Li
> Assignee: Chang Li
> Attachments: HDFS-8716.1.patch, HDFS-8716.2.patch
>
>
> During the start up, namenode waits for n replicas of each block to be
> reported by datanodes before exiting the safe mode. Currently n is tied to
> the min replicas config. We could set min replicas to more than one but we
> might want to exit safe mode as soon as each block has one replica reported.
> This can be worked out by introducing a new config variable for safe mode
> block count
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