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Date: Fri, 7 Aug 2009 15:03:14 -0700 (PDT)
From: "Todd Lipcon (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Subject: [jira] Updated: (HDFS-528) Add ability for safemode to wait for a
 minimum number of live datanodes
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     [ https://issues.apache.org/jira/browse/HDFS-528?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Todd Lipcon updated HDFS-528:
-----------------------------

    Summary: Add ability for safemode to wait for a minimum number of live datanodes  (was: Add dfsadmin -waitDatanodes feature to block until DNs have reported)

> Add ability for safemode to wait for a minimum number of live datanodes
> -----------------------------------------------------------------------
>
>                 Key: HDFS-528
>                 URL: https://issues.apache.org/jira/browse/HDFS-528
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: scripts
>    Affects Versions: 0.21.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>         Attachments: hdfs-528-v2.txt, hdfs-528.txt
>
>
> When starting up a fresh cluster programatically, users often want to wait until DFS is "writable" before continuing in a script. "dfsadmin -safemode wait" doesn't quite work for this on a completely fresh cluster, since when there are 0 blocks on the system, 100% of them are accounted for before any DNs have reported.
> This JIRA is to add a command which waits until a certain number of DNs have reported as alive to the NN.

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