I’m pretty sure HDFS HA is relegated to two name nodes (not four), designated active and standby. Secondly, I believe these properties should be in hdfs-site.xml NOT core-site.xml.
Furthermore, I think your HDFS nameservices are misconfigured. Consider the following: <?xml version="1.0"?> <configuration> <property> <name>dfs.replication</name> <value>3</value> </property> <property> <name>dfs.namenode.name.dir</name> <value>file:/var/data/hadoop/hdfs/nn</value> </property> <property> <name>dfs.datanode.data.dir</name> <value>file:/var/data/hadoop/hdfs/dn</value> </property> <property> <name>dfs.ha.automatic-failover.enabled</name> <value>true</value> </property> <property> <name>dfs.nameservices</name> <value>hdfs-cluster</value> </property> <property> <name>dfs.ha.namenodes.hdfs-cluster</name> <value>nn1,nn2</value> </property> <property> <name>dfs.namenode.rpc-address.hdfs-cluster.nn1</name> <value>namenode1:8020</value> </property> <property> <name>dfs.namenode.http-address.hdfs-cluster.nn1</name> <value>namenode1:50070</value> </property> <property> <name>dfs.namenode.rpc-address.hdfs-cluster.nn2</name> <value>namenode2:8020</value> </property> <property> <name>dfs.namenode.http-address.hdfs-cluster.nn2</name> <value>namenode2:50070</value> </property> <property> <name>dfs.namenode.shared.edits.dir</name> <value>qjournal://journalnode1:8485;journalnode2:8485;journalnode3:8485/hdfs-cluster</value> </property> <property> <name>dfs.client.failover.proxy.provider.hdfs-cluster</name> <value>org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider</value> </property> <property> <name>dfs.ha.fencing.methods</name> <value>sshfence</value> </property> <property> <name>dfs.ha.fencing.ssh.private-key-files</name> <value>/home/hadoop/.ssh/id_rsa</value> </property> </configuration> mn On Sep 28, 2014, at 12:56 PM, 清如许 <475053...@qq.com> wrote: > Hi, > > I'm new to hadoop and meet some problems when config HA. > Below are some important configuration in core-site.xml > > <property> > <name>dfs.nameservices</name> > <value>ns1,ns2</value> > </property> > <property> > <name>dfs.ha.namenodes.ns1</name> > <value>nn1,nn3</value> > </property> > <property> > <name>dfs.ha.namenodes.ns2</name> > <value>nn2,nn4</value> > </property> > <property> > <name>dfs.namenode.rpc-address.ns1.nn1</name> > <value>namenode1:9000</value> > </property> > <property> > <name>dfs.namenode.rpc-address.ns1.nn3</name> > <value>namenode3:9000</value> > </property> > <property> > <name>dfs.namenode.rpc-address.ns2.nn2</name> > <value>namenode2:9000</value> > </property> > <property> > <name>dfs.namenode.rpc-address.ns2.nn4</name> > <value>namenode4:9000</value> > </property> > <property> > <name>dfs.namenode.shared.edits.dir</name> > <value>qjournal://datanode2:8485;datanode3:8485;datanode4:8485/ns1</value> > </property> > <property> > <name>dfs.client.failover.proxy.provider.ns1</name> > > <value>org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider</value> > </property> > <property> > <name>dfs.ha.fencing.methods</name> > <value>sshfence</value> > </property> > <property> > <name>dfs.ha.fencing.ssh.private-key-files</name> > <value>/home/hduser/.ssh/id_rsa</value> > </property> > <property> > <name>dfs.ha.fencing.ssh.connect-timeout</name> > <value>30000</value> > </property> > <property> > <name>dfs.journalnode.edits.dir</name> > <value>/home/hduser/mydata/hdfs/journalnode</value> > </property> > > (two nameservice ns1,ns2 is for configuring federation later. In this step, I > only want launch ns1 on namenode1,namenode3) > > After configuration, I did the following steps > firstly, I start jornalnode on datanode2,datanode3,datanode4 > secondly I format datanode1 and start namenode on it > then i run 'hdfs namenode -bootstrapStandby' on the other namenode and start > namenode on it > > Everything seems fine unless no namenode is active now, then i tried to > active one by running > hdfs haadmin -transitionToActive nn1 on namenode1 > but strangely it says "Illegal argument: Unable to determine the nameservice > id." > > Could anyone tell me why it cannot determine nn1 from my configuration? > Is there something wrong in my configuraion? > > Thanks a lot!!! > >