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[ https://issues.apache.org/jira/browse/HDFS-528?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eli Collins resolved HDFS-528.
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Resolution: Fixed
Fix Version/s: 0.22.0
Hadoop Flags: [Reviewed]

Thanks Dhruba. I've committed this.
Add ability for safemode to wait for a minimum number of live datanodes
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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

Attachments: hdfs-528-v2.txt, hdfs-528-v3.txt, hdfs-528-v4.txt, hdfs-528.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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postedNov 18, '10 at 9:13p
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