[jira] Reopened: (HADOOP-1138) Datanodes that are dead for a long long time should not show up in the UI

["dhruba borthakur (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-1138?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

dhruba borthakur reopened HADOOP-1138:
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I think that if the includes list or the excludes list is present, these nodes should always show up in the UI. This allows the administrator to accurately know the state of his cluster.(  However, we do not need to automatically remove datanodes from the UI if they are dead for a certain period).

> 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
>
>         Attachments: HADOOP-1138.patch, HADOOP-1138.patch, HADOOP-1138.patch
>
>
> 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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