High-Availability

無法將 HDFS 從非 HA 轉換為 HA

  • January 13, 2015

介紹

**目標:**將 HDFS 從非 HA 轉換為 HA。

**方法:**根據本文件,應該可以通過實施以下配置將 HFDS 從非 HA 轉換為 HA:

/etc/hadoop/conf/hdfs-site.xml

<property>
  <name>dfs.ha.automatic-failover.enabled</name>
  <value>true</value>
</property>

/etc/hadoop/conf/core-site.xml

<property>
  <name>ha.zookeeper.quorum</name>
  <value>localhost:2181</value>
</property> 

並執行以下命令:

sudo service hadoop-hdfs-journalnode start

sudo service hadoop-hdfs-zkfc start

hdfs namenode -initializeSharedEdits

sudo -u hdfs hdfs namenode -bootstrapStandby

sudo service hadoop-hdfs-namenode start

結果:

14/06/09 15:37:15 FATAL namenode.NameNode: Exception in namenode join
java.io.IOException: org.apache.hadoop.HadoopIllegalArgumentException: HA is not enabled for this namenode.
       at org.apache.hadoop.hdfs.server.namenode.ha.BootstrapStandby.run(BootstrapStandby.java:310)
       at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1154)
       at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1241)
Caused by: org.apache.hadoop.HadoopIllegalArgumentException: HA is not enabled for this namenode.
       at org.apache.hadoop.hdfs.server.namenode.ha.BootstrapStandby.parseConfAndFindOtherNN(BootstrapStandby.java:261)
       at org.apache.hadoop.hdfs.server.namenode.ha.BootstrapStandby.run(BootstrapStandby.java:92)
       at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
       at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:84)
       at org.apache.hadoop.hdfs.server.namenode.ha.BootstrapStandby.run(BootstrapStandby.java:305)
       ... 2 more
14/06/09 15:37:15 INFO util.ExitUtil: Exiting with status 1
14/06/09 15:37:15 INFO namenode.NameNode: SHUTDOWN_MSG:
/************************************************************
SHUTDOWN_MSG: Shutting down NameNode at localhost/127.0.0.1
************************************************************/

問題

如何將 HDFS 從非 HA 轉換為 HA?

應用本文件中定義的配置(請參閱配置詳細資訊段落)後,問題HA is not enabled for this namenode得到解決。

<property>
 <name>dfs.namenode.rpc-address.mycluster.nn1</name>
 <value>machine1.example.com:8020</value>
</property>
<property>
 <name>dfs.namenode.rpc-address.mycluster.nn2</name>
 <value>machine2.example.com:8020</value>
</property>

分別在 ActiveNN 和 StandyNN 上應用其他配置設置將 HDFS 從非 HA 轉換為 HA。

引用自:https://serverfault.com/questions/604056