Autopopulate standby name dirs if they're empty
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Key: HDFS-2731
URL: https://issues.apache.org/jira/browse/HDFS-2731
Project: Hadoop HDFS
Issue Type: Sub-task
Components: ha
Affects Versions: HA branch (HDFS-1623)
Reporter: Eli Collins
Assignee: Eli Collins
To setup a SBN we currently format the primary then manually copy the name dirs
to the SBN. The SBN should do this automatically. Specifically, on NN startup,
if HA with a shared edits dir is configured and populated, if the SBN has empty
name dirs it should downloads the image and log from the primary (as an
optimization it could copy the logs from the shared dir). If the other NN is
still in standby then it should fails to start as it does currently.
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