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TestMetaMigrationConvertToPB uses the file TestMetaMigrationConvertToPB.tgz  for testing
upgrade to 0.96 from 0.92/0.94 cluster data. The files are untarred to the local
filesystem, and copied over to a minidfscluster. However, since the directory
name .META. causes problems on Windows, it has been renamed to -META- inside
the .tgz file. After untarring and copying the contents to minidfs,
TestMetaMigrationConvertToPB.setUpBeforeClass() renames the file back to .META.
See https://issues.apache.org/jira/browse/HBASE-6821.