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https://issues.apache.org/jira/browse/HADOOP-2159?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12540502
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Owen O'Malley commented on HADOOP-2159:
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I would check for floating point precision problems. If the calculation was
done carelessly, you may end up not being able to reach the desired goal of 1.0.
> Namenode stuck in safemode
> --------------------------
>
> Key: HADOOP-2159
> URL: https://issues.apache.org/jira/browse/HADOOP-2159
> Project: Hadoop
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.16.0
> Reporter: Christian Kunz
>
> Occasionally (not easy to reproduce) the namenode does turn off safemode
> automatically, although fsck does not report any missing or under-replicated
> blocks (safemode threshold set to 1.0).
> At this moment I do not have any additional information which could help
> analyze the issue.
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