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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-528) Add dfsadmin -waitDatanodes feature to block until DNs have reported
Date Wed, 05 Aug 2009 00:18:14 GMT
Add dfsadmin -waitDatanodes feature to block until DNs have reported

                 Key: HDFS-528
                 URL: https://issues.apache.org/jira/browse/HDFS-528
             Project: Hadoop HDFS
          Issue Type: New Feature
          Components: scripts
            Reporter: Todd Lipcon
            Assignee: Todd Lipcon

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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