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https://issues.apache.org/jira/browse/HADOOP-993?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12482934
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dhruba borthakur commented on HADOOP-993:
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After some discussion and code research, it appears to me that there is no real
reason to remove storing the datanodes from the fsimage. At least the storageid
of the datanode needs to be persisted (as pointed out by Yoram). A related
issue is that datanodes that are dead for a *long* period of time still appears
as "dead" datanodes in the UI.
We could close out this issue (unless somebody raises any questions) and we
could open a new JIRA issue to discuss how best to remove long-gone datanodes
from appearing in the UI.
> Namenode does not need to store any data node info persistently.
> ----------------------------------------------------------------
>
> Key: HADOOP-993
> URL: https://issues.apache.org/jira/browse/HADOOP-993
> Project: Hadoop
> Issue Type: Improvement
> Components: dfs
> Reporter: Raghu Angadi
> Assigned To: Sameer Paranjpye
> Attachments: noDatanodesInFsimage.patch
>
>
> Namenode does not need to serialize datanode info. It will map datanode to
> storageID when datanode register.
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