Arpit Agarwal created HDFS-5475:
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Summary: NN should not allow more than one replica per storage
Key: HDFS-5475
URL: https://issues.apache.org/jira/browse/HDFS-5475
Project: Hadoop HDFS
Issue Type: Sub-task
Components: namenode
Affects Versions: Heterogeneous Storage (HDFS-2832)
Reporter: Arpit Agarwal
Assignee: Arpit Agarwal
NN chooses a provisional target storage when allocating a new block and records
that block in the blockList of that storage. However the datanode is free to
choose a different storage for the block. On the next block report the NN ends
up with two blockList entries for the same replica+DN combination.
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