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Doing the copy in chunks to prevent too long jobs.

The copy happens from `hdfs://analytics-hadoop` (60 nodes analytics cluster) to `hdfs://analytics-backup-hadoop` (16 nodes cluster) The backup cluster stores data with a replication factor of 2 instead of 3 in regular analytics cluster. Doing the copy in chunks to prevent too long jobs.

The copy happens from `hdfs://analytics-hadoop` (60 nodes analytics cluster) to `hdfs://analytics-backup-hadoop` (16 nodes cluster) The backup cluster stores data with a replication factor of 2 instead of 3 in regular analytics cluster. Doing the copy in chunks to prevent too long jobs.

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