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https://issues.apache.org/jira/browse/HDFS-3847?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13440482#comment-13440482
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Eli Collins commented on HDFS-3847:
-----------------------------------
This is ensured by fencing, see the docs more details:
http://hadoop.apache.org/common/docs/current/hadoop-yarn/hadoop-yarn-site/HDFSHighAvailability.html
> using NFS As a shared storage for NameNode HA , how to ensure that only one
> write
> ---------------------------------------------------------------------------------
>
> Key: HDFS-3847
> URL: https://issues.apache.org/jira/browse/HDFS-3847
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: ha
> Affects Versions: 2.0.0-alpha, 2.0.1-alpha
> Reporter: liaowenrui
> Priority: Critical
> Fix For: 2.0.0-alpha
>
>
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