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https://issues.apache.org/jira/browse/HDFS-1541?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12973061#action_12973061
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dhruba borthakur commented on HDFS-1541:
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Also, there is no advantage to marking datanodes as dead when the namenode is
in safemode. The Nn anyway does not replicate blocks when it is in safemode. It
makes lots of sense to not mark datanodes as dead when the namenode is in
safemode.
> Not marking datanodes dead When namenode in safemode
> ----------------------------------------------------
>
> Key: HDFS-1541
> URL: https://issues.apache.org/jira/browse/HDFS-1541
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: name-node
> Affects Versions: 0.23.0
> Reporter: Hairong Kuang
> Assignee: Hairong Kuang
> Fix For: 0.23.0
>
>
> In a big cluster, when namenode starts up, it takes a long time for namenode
> to process block reports from all datanodes. Because heartbeats processing
> get delayed, some datanodes are erroneously marked as dead, then later on
> they have to register again, thus wasting time.
> It would speed up starting time if the checking of dead nodes is disabled
> when namenode in safemode.
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