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https://issues.apache.org/jira/browse/HDFS-11090?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15630287#comment-15630287
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Kihwal Lee commented on HDFS-11090:
-----------------------------------
I agree with [~jingzhao]. If people don't want safe mode extension, it can be
configured off. But something like this might make sense to standby namenodes,
since they are not going to start replicating after leaving a safe mode.
> 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
> Assignee: Yiqun Lin
> Attachments: HDFS-11090.001.patch
>
>
> 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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