HDFS Administration
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Step 2: Storage Group Pairing

The HDFS Balancer selects over-utilized or above-average storage as source storage, and under-utilized or below-average storage as target storage. It pairs a source storage group with a target storage group (source → target) in the following priority order:

  • Same-Rack (where the source and the target storage reside in the same rack)

    Over-Utilized → Under-Utilize

    Over-Utilized → Below-Average

    Above-Average → Under-Utilized

  • Any (where the source and target storage do not reside in the same rack)

    Over-Utilized → Under-Utilized

    Over-Utilized → Below-Average

    Above-Average → Under-Utilized