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https://issues.apache.org/jira/browse/HADOOP-1138?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12521935
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Raghu Angadi commented on HADOOP-1138:
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There are two related issues here :
# Datanodes displayed in webui and "dfs -report"
# Policy regd storing all the known storage ids and datanodes persistently in
Namenode.
I will file a different jira for the second one.
> Datanodes that are dead for a long long time should not show up in the UI
> -------------------------------------------------------------------------
>
> Key: HADOOP-1138
> URL: https://issues.apache.org/jira/browse/HADOOP-1138
> Project: Hadoop
> Issue Type: Bug
> Components: dfs
> Reporter: dhruba borthakur
> Assignee: Raghu Angadi
> Fix For: 0.15.0
>
>
> Proposal 1:
> If a include files is used, then show all nodes (dead/alive) that are listed
> in the includes file. If there isn't an include file, then display only nodes
> that have pinged this instance of the namenode.
> Proposal2:
> A config variable specifies the time duration. The namenode, on a restart,
> purges all datanodes that have not pinged for that time duration. The default
> value of this config variable can be 1 week.
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