Danny Becker created HDFS-15031:

             Summary: Allow BootstrapStandby to download FSImage if the 
directory is already formatted
                 Key: HDFS-15031
                 URL: https://issues.apache.org/jira/browse/HDFS-15031
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: hdfs, namenode
            Reporter: Danny Becker

Currently, BootstrapStandby will only download the latest FSImage if it has 
formatted the local image directory. This can be an issue when there are out of 
date FSImages on a Standby NameNode, as the non-interactive mode will not 
format the image directory, and BootstrapStandby will return an error code. The 
changes here simply allow BootstrapStandby to download the latest FSImage to 
the image directory, without needing to format first.

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