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https://issues.apache.org/jira/browse/HADOOP-1070?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12478512
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Nigel Daley commented on HADOOP-1070:
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My guess this is caused by some interaction between the rack aware patch, the
Datanode IP address patch and hostnames being stored in the fsimage file.
> Number of racks and datanode double temporarily when upgrading from 0.10.1 to
> 0.11.2
> ------------------------------------------------------------------------------------
>
> Key: HADOOP-1070
> URL: https://issues.apache.org/jira/browse/HADOOP-1070
> Project: Hadoop
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.11.2
> Reporter: Nigel Daley
>
> When upgrading from Hadoop 0.10.1 to 0.11.2, I see the number of racks and
> datanode double after the 2nd startup of the Namenode. After the 3rd
> startup, they correct themselves:
> Namenode Log After 1st Startup:
> 2007-03-06 18:27:27,045 INFO org.apache.hadoop.dfs.StateChange: STATE*
> Network topology has 1 racks and 4 datanodes
> Namenode Log After 2nd Startup:
> 2007-03-06 18:27:43,201 INFO org.apache.hadoop.dfs.StateChange: STATE*
> Network topology has 2 racks and 8 datanodes
> Namenode Log After 3rd Startup:
> 2007-03-06 18:28:09,730 INFO org.apache.hadoop.dfs.StateChange: STATE*
> Network topology has 1 racks and 4 datanodes
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