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https://issues.apache.org/jira/browse/HDFS-11090?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15627326#comment-15627326
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Mingliang Liu commented on HDFS-11090:
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Do we still need to consider the datanode threshold, and
{{dfs.namenode.safemode.replication.min}} (which is 1 by default)?
> Leave safemode immediately if all blocks have reported in
> ---------------------------------------------------------
>
> Key: HDFS-11090
> URL: https://issues.apache.org/jira/browse/HDFS-11090
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Affects Versions: 2.7.3
> Reporter: Andrew Wang
>
> Startup safemode is triggered by two thresholds: % blocks reported in, and
> min # datanodes. It's extended by an interval (default 30s) until these two
> thresholds are met.
> Safemode extension is helpful when the cluster has data, and the default %
> blocks threshold (0.99) is used. It gives DNs a little extra time to report
> in and thus avoid unnecessary replication work.
> However, we can leave startup safemode early if 100% of blocks have reported
> in.
> Note that operators sometimes change the % blocks threshold to > 1 to never
> automatically leave safemode. We should maintain this behavior.
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