HDFS considers blocks under-replicated if topology script is configured with
only 1 rack
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Key: HDFS-3256
URL: https://issues.apache.org/jira/browse/HDFS-3256
Project: Hadoop HDFS
Issue Type: Bug
Affects Versions: 2.0.0
Reporter: Aaron T. Myers
Assignee: Aaron T. Myers
HDFS treats the mere presence of a topology script being configured as of
evidence that there are multiple racks. If there is in fact only a single rack,
the NN will try to place the blocks on at least two racks, and thus blocks will
be considered to be under-replicated.
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