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https://issues.apache.org/jira/browse/HADOOP-1261?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12489213
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Konstantin Shvachko commented on HADOOP-1261:
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Could you check whether we can also get rid of clusterMap.remove() and
clusterMap.add() in case nodeN == nodeS.
It seems logical not to do anything if the same node is restarting.
Also I see dnReg is used only to set a correct ip address in nodeReg. There
should be an easier way.
> Restart of the same data-node should not generate edits log records.
> --------------------------------------------------------------------
>
> Key: HADOOP-1261
> URL: https://issues.apache.org/jira/browse/HADOOP-1261
> Project: Hadoop
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.12.0
> Reporter: Konstantin Shvachko
> Assigned To: Raghu Angadi
> Priority: Minor
> Fix For: 0.13.0
>
> Attachments: HADOOP-1261-1.patch
>
>
> Currently during registration of a data-node with the storage id that has
> already been registered
> the name-node logs 2 records: <add node1> <remove node2>.
> If the same node has been restarted these two records are redundant, lead to
> unnecessary
> increase of the edits file and result in a slow-down of the name-node startup.
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