namenode ha by zookeeper

tickTime=2000

initLimit=10

syncLimit=5

clientPort=2181

dataDir=/home/tim/zkdata

server.1=tim-dn1:2888:3888

server.2=tim-dn2:2888:3888

server.3=tim-dn3:2888:3888

core-site.xml

<configuration>

   <!–

   <property>

      <name>fs.defaultFS</name>

      <value>hdfs://tim-nn:9000</value> 

   </property>

   –>

  <property>

  <name>fs.defaultFS</name>

  <value>hdfs://mycluster</value>

  </property>

</configuration>

hdfs-site.xml

tim@tim-dn2:~/hadoop/etc/hadoop$ cat hdfs-site.xml 

<?xml version=”1.0″ encoding=”UTF-8″?>

<?xml-stylesheet type=”text/xsl” href=”configuration.xsl”?>

<!–

  Licensed under the Apache License, Version 2.0 (the “License”);

  you may not use this file except in compliance with the License.

  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software

  distributed under the License is distributed on an “AS IS” BASIS,

  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  See the License for the specific language governing permissions and

  limitations under the License. See accompanying LICENSE file.

–>

<!– Put site-specific property overrides in this file. –>

<configuration>

<property>

  <name>dfs.replication</name>

  <value>3</value>

</property>

<property>

  <name>dfs.nameservices</name>

  <value>mycluster</value>

</property>

<property>

  <name>dfs.ha.namenodes.mycluster</name>

  <value>nn1,nn2</value>

</property>

<property>

  <name>dfs.namenode.rpc-address.mycluster.nn1</name>

  <value>tim-nn:8020</value>

</property>

<property>

  <name>dfs.namenode.rpc-address.mycluster.nn2</name>

  <value>tim-2nn:8020</value>

</property>

<property>

  <name>dfs.namenode.http-address.mycluster.nn1</name>

  <value>tim-nn:50070</value>

</property>

<property>

  <name>dfs.namenode.http-address.mycluster.nn2</name>

  <value>tim-2nn:50070</value>

</property>

<property>

  <name>dfs.namenode.shared.edits.dir</name>

  <value>qjournal://tim-nn:8485;tim-2nn:8485/mycluster</value>

</property>

<property>

  <name>dfs.client.failover.proxy.provider.mycluster</name>

  <value>org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider</value>

</property>

<property>

<property>

  <name>dfs.journalnode.edits.dir</name>

  <value>/home/tim/hadoop/journal</value>

</property>

</configuration>

停掉hdfs集群后

启用自动容灾
hdfs-site
 <property>
   <name>dfs.ha.automatic-failover.enabled</name>
   <value>true</value>
 </property>

his specifies that the cluster should be set up for automatic failover. In your core-site.xml file, add:

 <property>
   <name>ha.zookeeper.quorum</name>
   <value>zk1.example.com:2181,zk2.example.com:2181,zk3.example.com:2181</value>
 </property>

tim@tim-dn2:~/hadoop/etc/hadoop$ nano core-site.xml 

  GNU nano 2.5.3                                           File: core-site.xml                                                                                   Modified  

–>

<!– Put site-specific property overrides in this file. –>

<configuration>

   <!–

   <property>

      <name>fs.defaultFS</name>

      <value>hdfs://tim-nn:9000</value> 

   </property>

   –>

  <property>

  <name>fs.defaultFS</name>

  <value>hdfs://mycluster</value>

  </property>

<property>

   <name>ha.zookeeper.quorum</name>

   <value>tim-dn1:2181,tim-dn2:2181,tim-dn3:2181</value>

 </property>

</configuration>

启动zk集群后

tim@tim-nn:~$ hdfs zkfc -formatZK

用于在zk集群创建/hadoop-ha/mycluster目录