Fix reporting of 2NN address when dfs.secondary.http.address is default
(wildcard)
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Key: HDFS-1464
URL: https://issues.apache.org/jira/browse/HDFS-1464
Project: Hadoop HDFS
Issue Type: Bug
Components: name-node
Affects Versions: 0.22.0
Reporter: Todd Lipcon
HDFS-1080 broke the way that the 2NN identifies its own hostname to the NN
during checkpoint upload. It used to use the local hostname, which as HDFS-1080
pointed out was error prone if it had multiple interfaces, etc. But now, with
the default setting of dfs.secondary.http.address, the 2NN reports "0.0.0.0",
which won't work either.
We should look for the wildcard bind address and use the local hostname in that
case, like we used to.
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