How Do I Modify the HDFS Active/Standby Switchover Class?

If the org.apache.hadoop.hdfs.server.namenode.ha.AdaptiveFailoverProxyProvider class is unavailable when a cluster of MRS 3.x connects to NameNodes using HDFS, the cause is that the HDFS active/standby switchover class of the cluster is configured improperly. To solve the problem, perform the following operations:

• Method 1: Add the hadoop-plugins-xxx.jar package to the classpath or lib directory of your program.

  The hadoop-plugins-xxx.jar package is stored in the HDFS client directory, for example, $HADOOP_HOME/share/hadoop/common/lib/hadoop-plugins-8.0.2-302023.jar.

• Method 2: Change the configuration item of HDFS to the corresponding open source class, as shown in the follows:

  dfs.client.failover.proxy.provider.hacluster=org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider