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1. The URI format of KylinConfig is not backward compatible, for it fetches metadata storage information by http request, older version may not be supported.
2. only one of "-cube", "-srcProject", "-allCubes" could only be present to specify metadata to migratebe specified.
3. "-migrateSegment" will not be able to migrate segment data from older version to 4.0, because storage type is switched from HBase to Parquet.
4. CubeMigrationCli will reload target cluster's metadata, we don't have to restart target cluster.

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