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https://issues.apache.org/jira/browse/HDFS-1129?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12932738#action_12932738
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dhruba borthakur commented on HDFS-1129:
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This is not a 1.0 issue, it is basically to allow a administrator to allow
updating datanode jars without updating namenode jars.
> Allow HDFS DataNodes and NameNode to have different build versions
> ------------------------------------------------------------------
>
> Key: HDFS-1129
> URL: https://issues.apache.org/jira/browse/HDFS-1129
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: dhruba borthakur
> Assignee: Dmytro Molkov
>
> There are times when we want to deploy fixes to the NameNode without
> restarting the DataNodes. This reduces the restart time of the entire cluster.
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