[jira] Commented: (HDFS-1129) Allow HDFS DataNodes and NameNode to have different build versions

["dhruba borthakur (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HDFS-1129?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12864159#action_12864159 ] 

dhruba borthakur commented on HDFS-1129:
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The NameNode checks whether the build version of a datanode matches the build version of the namenode. I propose that we do the following:

1. The namenode should ensure that datanodes match the namenode's build version if the value of a configuration parameter is set to true. Otherwise, it avoids doing this check. 

2. The default value of this config parameter would be set to true.

3. The webUi and "dfsadmin -report" should display the build versions reported by the datanodes.

The above functionality is also useful to support hot-standby namenode, via HDFS-976

> 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
>
> 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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