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https://issues.apache.org/jira/browse/HDFS-4210?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13500979#comment-13500979
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Damien Hardy commented on HDFS-4210:
------------------------------------
Actually this should not be the nominal case but when creating a cluster we
often start by provisioning master nodes only (NN + ZK + JN + ZKFC + 1JTmr1),
make them work together and then pay attention to worker nodes (DN + TTmr1).
But ZK and JournaleNode need to be at least 3. So we choose to put them on one
of our worker. And all config file are set in this way.
This is just for convenient purpose.
And yes a good idea would be a nice error message :)
> NameNode Format should not fail for DNS resolution on minority of JournalNode
> -----------------------------------------------------------------------------
>
> Key: HDFS-4210
> URL: https://issues.apache.org/jira/browse/HDFS-4210
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: ha, journal-node, name-node
> Affects Versions: 2.0.0-alpha
> Environment: CDH4.1.2
> Reporter: Damien Hardy
> Priority: Trivial
>
> Setting :
> qjournal://cdh4master01:8485;cdh4master02:8485;cdh4worker03:8485/hdfscluster
> cdh4master01 and cdh4master02 JournalNode up and running,
> cdh4worker03 not yet provisionning (no DNS entrie)
> With :
> `hadoop namenode -format` fails with :
> 12/11/19 14:42:42 FATAL namenode.NameNode: Exception in namenode join
> java.lang.IllegalArgumentException: Unable to construct journal,
> qjournal://cdh4master01:8485;cdh4master02:8485;cdh4worker03:8485/hdfscluster
> at
> org.apache.hadoop.hdfs.server.namenode.FSEditLog.createJournal(FSEditLog.java:1235)
> 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.NameNode.format(NameNode.java:745)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1099)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1204)
> Caused by: java.lang.reflect.InvocationTargetException
> at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
> at
> sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
> at
> sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
> at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
> at
> org.apache.hadoop.hdfs.server.namenode.FSEditLog.createJournal(FSEditLog.java:1233)
> ... 5 more
> Caused by: java.lang.NullPointerException
> at
> org.apache.hadoop.hdfs.qjournal.client.IPCLoggerChannelMetrics.getName(IPCLoggerChannelMetrics.java:107)
> at
> org.apache.hadoop.hdfs.qjournal.client.IPCLoggerChannelMetrics.create(IPCLoggerChannelMetrics.java:91)
> at
> org.apache.hadoop.hdfs.qjournal.client.IPCLoggerChannel.<init>(IPCLoggerChannel.java:161)
> at
> org.apache.hadoop.hdfs.qjournal.client.IPCLoggerChannel$1.createLogger(IPCLoggerChannel.java:141)
> at
> org.apache.hadoop.hdfs.qjournal.client.QuorumJournalManager.createLoggers(QuorumJournalManager.java:353)
> at
> org.apache.hadoop.hdfs.qjournal.client.QuorumJournalManager.createLoggers(QuorumJournalManager.java:135)
> at
> org.apache.hadoop.hdfs.qjournal.client.QuorumJournalManager.<init>(QuorumJournalManager.java:104)
> at
> org.apache.hadoop.hdfs.qjournal.client.QuorumJournalManager.<init>(QuorumJournalManager.java:93)
> ... 10 more
> I suggest that if quorum is up format should not fails.
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