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https://issues.apache.org/jira/browse/HDFS-1541?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13011456#comment-13011456
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Suresh Srinivas commented on HDFS-1541:
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I committed the patch to branch-0.20-security
> 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
>
> Attachments: deadnodescheck.patch, deadnodescheck1.patch,
> deadnodescheck1_0.20-security.patch
>
>
> 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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