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