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https://issues.apache.org/jira/browse/HADOOP-1070?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12478984
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Raghu Angadi commented on HADOOP-1070:
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>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:
This is between 0.11.2 and 0.12.x
> 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
Because namenode was restarted before check point in the prev run, both
hostName and ip are added to n/w topology. When a datanode is removed in the
image or edits log, we dont delete its entry from n/w topo, I am not sure why.
Now only ip entries get updated with the new topo info. This explains extra
nodes. Now new image is written to disk (equivalent to a checkpoint in the
first start up).
>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
Because there at least one checkpoint, we dont see multiple entries.
I am not entirely sure how LOG_DATANODE_REMOVE operation is handled.
> 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
> Assigned To: Raghu Angadi
> Fix For: 0.13.0
>
>
> 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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