Description
When attempting to initialize Accumulo and the instance.dfs.dir is pointing at a directory in HDFS which has already been initialized, you get a very undescriptive warning message which doesn't actually say refer to the fact that this is an HDFS directory.
[util.Initialize] FATAL: It appears this location was previously initialized, exiting ...
It would be better to be explicit and tell the user that their $instance.dfs.dir value already has been initialized in HDFS instead of leaving that up to the user to discern.
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