Bug in check for DN re-registration with different storage ID
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Key: HDFS-3224
URL: https://issues.apache.org/jira/browse/HDFS-3224
Project: Hadoop HDFS
Issue Type: Bug
Reporter: Eli Collins
Priority: Minor
DatanodeManager#registerDatanode checks the host to node map using an IP:port
key, however the map is keyed on IP, so this check will always fail. It's
performing the check to determine if a DN with the same IP and storage ID has
already registered, and if so to remove this DN from the map and indicate that
eg it's no longer hosting these blocks. This bug has been here forever.
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