DatanodeID.ipcPort is not updated when existing node re-registers
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Key: HDFS-894
URL: https://issues.apache.org/jira/browse/HDFS-894
Project: Hadoop HDFS
Issue Type: Bug
Affects Versions: 0.20.1, 0.21.0, 0.22.0
Reporter: Todd Lipcon
Priority: Blocker
In FSNamesystem.registerDatanode, it checks if a registering node is a
reregistration of an old one based on storage ID. If so, it simply updates the
old one with the new registration info. However, the new ipcPort is lost when
this happens.
I produced manually this by setting up a DN with IPC port set to 0 (so it picks
an ephemeral port) and then restarting the DN. At this point, the NN's view of
the ipcPort is stale, and clients will not be able to achieve pipeline recovery.
This should be easy to fix and unit test, but not sure when I'll get to it, so
anyone else should feel free to grab it if they get to it first.
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