报错

hadoop配置HA后启动hive报错
Exception in thread "main" java.lang.IllegalArgumentException: java.net.UnknownHostException: hadoopcluster

[root@master hive]# hive
which: no hbase in (/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin:/usr/local/src/jdk/bin:/usr/local/src/hadoop/bin:/usr/local/src/hadoop/sbin:/usr/local/src/zookeeper/bin:/usr/local/src/hive/bin:/usr/local/src/scala/bin:/usr/local/src/spark/bin:/usr/local/src/sqoop/bin:/usr/local/src/kafka/bin:/usr/local/src/flume/bin:/usr/local/src/flink/bin)
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/usr/local/src/hive/lib/log4j-slf4j-impl-2.6.2.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/usr/local/src/hadoop/share/hadoop/common/lib/slf4j-log4j12-1.7.10.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.apache.logging.slf4j.Log4jLoggerFactory]

Logging initialized using configuration in jar:file:/usr/local/src/hive/lib/hive-common-2.3.4.jar!/hive-log4j2.properties Async: true
Exception in thread "main" java.lang.IllegalArgumentException: java.net.UnknownHostException: hadoopcluster
    at org.apache.hadoop.security.SecurityUtil.buildTokenService(SecurityUtil.java:377)
    at org.apache.hadoop.hdfs.NameNodeProxies.createNonHAProxy(NameNodeProxies.java:320)
    at org.apache.hadoop.hdfs.NameNodeProxies.createProxy(NameNodeProxies.java:176)
    at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:687)
    at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:628)
    at org.apache.hadoop.hdfs.DistributedFileSystem.initialize(DistributedFileSystem.java:149)
    at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2667)
    at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:93)
    at org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:2701)
    at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2683)
    at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:372)
    at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:171)
    at org.apache.hadoop.hive.ql.session.SessionState.start(SessionState.java:579)
    at org.apache.hadoop.hive.ql.session.SessionState.beginStart(SessionState.java:549)
    at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:750)
    at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:686)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.apache.hadoop.util.RunJar.run(RunJar.java:226)
    at org.apache.hadoop.util.RunJar.main(RunJar.java:141)
Caused by: java.net.UnknownHostException: hadoopcluster
    ... 22 more

原因

原因是hadoop配置文件hdfs-site.xml的nameservices的名称为hadoopcluster

<!-- 指定hdfs的nameservices名称为hadoopcluster -->
<property>
    <name>dfs.nameservices</name>
    <value>hadoopcluster</value>
</property>

而指定HDFS客户端连接active namenode的java类时漏写了client

<property>
    <name>dfs.failover.proxy.provider.hadoopcluster</name>
    <value>org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider</value>
</property>

修改为：

<property>
    <name>dfs.client.failover.proxy.provider.hadoopcluster</name>
    <value>org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider</value>
</property>