Colin Patrick McCabe created HDFS-4957:
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Summary: NameNode failover should not fail because a DNS entry for
a quorum node cannot be resolved
Key: HDFS-4957
URL: https://issues.apache.org/jira/browse/HDFS-4957
Project: Hadoop HDFS
Issue Type: Bug
Components: qjm
Affects Versions: 2.2.0
Reporter: Colin Patrick McCabe
When a StandbyNameNode is becoming active, we should not bail out because a DNS
entry for a quorum node cannot be resolved. Currently it does fail in this
scenario, with a message like this:
{code}
2013-07-03 21:28:40,576 INFO
org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Starting services required
for active state
2013-07-03 21:28:40,579 FATAL org.apache.hadoop.hdfs.server.namenode.NameNode:
Error encountered requiring NN shutdown. Shutting down immediately.
java.lang.IllegalArgumentException: Unable to construct journal,
qjournal://hadoop-mm:8485;hadoop-nn-0:8485;hadoop-nn-1:8485/hadoop
at
org.apache.hadoop.hdfs.server.namenode.FSEditLog.createJournal(FSEditLog.java:1254)
at
org.apache.hadoop.hdfs.server.namenode.FSEditLog.initJournals(FSEditLog.java:226)
at
org.apache.hadoop.hdfs.server.namenode.FSEditLog.initJournalsForWrite(FSEditLog.java:193)
at
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startActiveServices(FSNamesystem.java:722)
<etc>
{code}
reported by Matt Bookman
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