Add dfsadmin -waitDatanodes feature to block until DNs have reported
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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
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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