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Date: Mon, 19 Nov 2012 06:54:59 +0000 (UTC)
From: "Matt Foley (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <1795378505.1929.1353308099589.JavaMail.jiratomcat@arcas>
Subject: [jira] [Commented] (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:comment-tabpanel&focusedCommentId=13500056#comment-13500056 ] 

Matt Foley commented on HDFS-528:
---------------------------------

Merged to branch-1.1.
                
> 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: 0.22.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>             Fix For: 0.22.0, 1.1.1
>
>         Attachments: h528_20120731_b-1.patch, hdfs-528.txt, hdfs-528.txt, hdfs-528-v2.txt, hdfs-528-v3.txt, hdfs-528-v4.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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