获取集群节点信息_hive连接的时候如何获取主节点-优快云博客

本文介绍了一种方法，通过Java代码在Hadoop集群中获取每个节点的详细信息，包括主机名、IP地址、端口、节点容量等，并展示了如何避免ClassCastException异常，确保正确使用DistributedFileSystem。

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要求获取出集群中每一台节点的如下信息：
主机名:
ip:
port:
节点容量:

很简单就将FileSystem类型转换为DistributedFileSystem 一切就可以获得了

用户设置的话在idea加这句-DHADOOP_USER_NAME=root
或者在代码中加入System.setProperty("HADOOP_USER_NAME","root");
/**
 * 作者:Shishuai
 * 文件名：Test
 * 时间：2019/9/2 20:38
 */

package com;


import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;


import org.apache.hadoop.hdfs.DistributedFileSystem;
import org.apache.hadoop.hdfs.protocol.DatanodeInfo;


import java.io.IOException;

public class Test {
    public static void main(String[] args) throws IOException {
//        InputFormat
//        FileInputFormat分片
//        HashPartitioner
//        int a = -2;
//        int res = a & Integer.MAX_VALUE;
//        System.out.println(res);
        Configuration conf = new Configuration();
        conf.set("fs.defaultFS", "hdfs://qf");
        conf.set("dfs.nameservices", "qf");
        conf.set("dfs.ha.namenodes.qf", "nn1, nn2");
        conf.set("dfs.namenode.rpc-address.qf.nn1", "hadoop01:8020");
        conf.set("dfs.namenode.rpc-address.qf.nn2", "hadoop02:8020");
        conf.set("dfs.client.failover.proxy.provider.qf", "org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider");
        FileSystem fs = FileSystem.get(conf);
        DatanodeInfo[] dataNodeStats = ((DistributedFileSystem) fs).getDataNodeStats();
// Exception in thread "main" java.lang.ClassCastException: org.apache.hadoop.fs.LocalFileSystem
// cannot be cast to org.apache.hadoop.hdfs.DistributedFileSystem
//	at com.Test.main(Test.java:35)

// 原因是DistributedFileSystem和LocalFileSystem都是FileSystem的子类，
// FileSystem.get(conf)得到的是LocalFileSystem的instance, 这个类型应该是默认的，
// 要获得DistributedFileSystem，需要配置conf对象,按照我的写法我觉得应该是配了conf对象了，
// 但是还是报错，最后按照网上的说法进行相应修改就可以了。直接上修改后的代码如下(注意红色部分):
//        DistributedFileSystem distributedFileSystem = (DistributedFileSystem) fs;
//        DatanodeInfo[] dataNodeStats = distributedFileSystem.getDataNodeStats();
        for(DatanodeInfo datanodeInfo : dataNodeStats){
            System.out.println("-----------------------------------------------------------------");
            System.out.println("datanodeInfo"+ "\t"+ datanodeInfo);
            System.out.println("getAdminState"+  "\t"+ datanodeInfo.getAdminState());
            System.out.println("getBlockPoolUsed"+  "\t"+ datanodeInfo.getBlockPoolUsed());
            System.out.println("getBlockPoolUsed"+  "\t"+ datanodeInfo.getBlockPoolUsed());
            System.out.println("getBlockPoolUsedPercent"+ "\t"+  datanodeInfo.getBlockPoolUsedPercent());
            System.out.println("getCacheCapacity"+  "\t"+ datanodeInfo.getCacheCapacity());
            System.out.println("getCacheUsed"+  "\t"+ datanodeInfo.getCacheUsed());
            System.out.println("getCapacity"+ "\t"+  datanodeInfo.getCapacity());
            System.out.println("getDatanodeReport"+  "\t"+ datanodeInfo.getDatanodeReport());
            System.out.println("getDependentHostNames"+  "\t"+ datanodeInfo.getDependentHostNames());
            System.out.println("getDfsUsed"+  "\t"+ datanodeInfo.getDfsUsed());
            System.out.println("getName"+  "\t"+ datanodeInfo.getName());
            System.out.println("getNetworkLocation"+  "\t"+ datanodeInfo.getNetworkLocation());
            System.out.println("getHostName"+  "\t"+ datanodeInfo.getHostName());
            System.out.println("getParent"+  "\t"+ datanodeInfo.getParent());
            System.out.println("getClass"+  "\t"+ datanodeInfo.getClass());
            System.out.println("getIpAddr"+  "\t"+ datanodeInfo.getIpAddr());
            System.out.println("getInfoAddr"+  "\t"+ datanodeInfo.getInfoAddr());
            System.out.println("getInfoPort"+  "\t"+ datanodeInfo.getInfoPort());
        }
    }
}

在这里插入图片描述

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uncher\1.9.1\ant-launcher-1.9.1.jar;D:\install\mavenrepository\org\apache\thrift\libfb303\0.9.2\libfb303-0.9.2.jar;D:\install\mavenrepository\org\apache\ivy\ivy\2.4.0\ivy-2.4.0.jar;D:\install\mavenrepository\org\apache\curator\curator-framework\2.6.0\curator-framework-2.6.0.jar;D:\install\mavenrepository\org\codehaus\groovy\groovy-all\2.1.6\groovy-all-2.1.6.jar;D:\install\mavenrepository\org\datanucleus\datanucleus-core\3.2.10\datanucleus-core-3.2.10.jar;D:\install\mavenrepository\org\apache\calcite\calcite-core\1.2.0-incubating\calcite-core-1.2.0-incubating.jar;D:\install\mavenrepository\org\apache\calcite\calcite-linq4j\1.2.0-incubating\calcite-linq4j-1.2.0-incubating.jar;D:\install\mavenrepository\net\hydromatic\eigenbase-properties\1.1.5\eigenbase-properties-1.1.5.jar;D:\install\mavenrepository\org\codehaus\janino\janino\2.7.6\janino-2.7.6.jar;D:\install\mavenrepository\org\codehaus\janino\commons-compiler\2.7.6\commons-compiler-2.7.6.jar;D:\install\mavenrepository\org\pentaho\pentaho-aggdesigner-algorithm\5.1.5-jhyde\pentaho-aggdesigner-algorithm-5.1.5-jhyde.jar;D:\install\mavenrepository\org\apache\calcite\calcite-avatica\1.2.0-incubating\calcite-avatica-1.2.0-incubating.jar;D:\install\mavenrepository\stax\stax-api\1.0.1\stax-api-1.0.1.jar;D:\install\mavenrepository\jline\jline\2.12\jline-2.12.jar;D:\install\mavenrepository\org\apache\maven\plugins\maven-resources-plugin\2.4.3\maven-resources-plugin-2.4.3.jar;D:\install\mavenrepository\org\apache\maven\maven-plugin-api\2.0.6\maven-plugin-api-2.0.6.jar;D:\install\mavenrepository\org\apache\maven\maven-project\2.0.6\maven-project-2.0.6.jar;D:\install\mavenrepository\org\apache\maven\maven-profile\2.0.6\maven-profile-2.0.6.jar;D:\install\mavenrepository\org\apache\maven\maven-artifact-manager\2.0.6\maven-artifact-manager-2.0.6.jar;D:\install\mavenrepository\org\apache\maven\maven-plugin-registry\2.0.6\maven-plugin-registry-2.0.6.jar;D:\install\mavenrepository\org\apache\maven\maven-core\2.0.6\maven-core-2.0.6.jar;D:\install\mavenrepository\org\apache\maven\wagon\wagon-file\1.0-beta-2\wagon-file-1.0-beta-2.jar;D:\install\mavenrepository\org\apache\maven\maven-plugin-parameter-documenter\2.0.6\maven-plugin-parameter-documenter-2.0.6.jar;D:\install\mavenrepository\org\apache\maven\wagon\wagon-http-lightweight\1.0-beta-2\wagon-http-lightweight-1.0-beta-2.jar;D:\install\mavenrepository\org\apache\maven\wagon\wagon-http-shared\1.0-beta-2\wagon-http-shared-1.0-beta-2.jar;D:\install\mavenrepository\jtidy\jtidy\4aug2000r7-dev\jtidy-4aug2000r7-dev.jar;D:\install\mavenrepository\org\apache\maven\reporting\maven-reporting-api\2.0.6\maven-reporting-api-2.0.6.jar;D:\install\mavenrepository\org\apache\maven\doxia\doxia-sink-api\1.0-alpha-7\doxia-sink-api-1.0-alpha-7.jar;D:\install\mavenrepository\org\apache\maven\wagon\wagon-provider-api\1.0-beta-2\wagon-provider-api-1.0-beta-2.jar;D:\install\mavenrepository\org\apache\maven\maven-repository-metadata\2.0.6\maven-repository-metadata-2.0.6.jar;D:\install\mavenrepository\org\apache\maven\maven-error-diagnostics\2.0.6\maven-error-diagnostics-2.0.6.jar;D:\install\mavenrepository\org\apache\maven\wagon\wagon-ssh-external\1.0-beta-2\wagon-ssh-external-1.0-beta-2.jar;D:\install\mavenrepository\org\apache\maven\wagon\wagon-ssh-common\1.0-beta-2\wagon-ssh-common-1.0-beta-2.jar;D:\install\mavenrepository\org\apache\maven\maven-plugin-descriptor\2.0.6\maven-plugin-descriptor-2.0.6.jar;D:\install\mavenrepository\org\codehaus\plexus\plexus-interactivity-api\1.0-alpha-4\plexus-interactivity-api-1.0-alpha-4.jar;D:\install\mavenrepository\org\apache\maven\wagon\wagon-ssh\1.0-beta-2\wagon-ssh-1.0-beta-2.jar;D:\install\mavenrepository\classworlds\classworlds\1.1\classworlds-1.1.jar;D:\install\mavenrepository\org\apache\maven\maven-artifact\2.0.6\maven-artifact-2.0.6.jar;D:\install\mavenrepository\org\apache\maven\maven-settings\2.0.6\maven-settings-2.0.6.jar;D:\install\mavenrepository\org\apache\maven\maven-model\2.0.6\maven-model-2.0.6.jar;D:\install\mavenrepository\org\apache\maven\maven-monitor\2.0.6\maven-monitor-2.0.6.jar;D:\install\mavenrepository\org\codehaus\plexus\plexus-container-default\1.0-alpha-9-stable-1\plexus-container-default-1.0-alpha-9-stable-1.jar;D:\install\mavenrepository\org\codehaus\plexus\plexus-utils\2.0.5\plexus-utils-2.0.5.jar;D:\install\mavenrepository\org\apache\maven\shared\maven-filtering\1.0-beta-4\maven-filtering-1.0-beta-4.jar;D:\install\mavenrepository\org\sonatype\plexus\plexus-build-api\0.0.4\plexus-build-api-0.0.4.jar;D:\install\mavenrepository\org\codehaus\plexus\plexus-interpolation\1.13\plexus-interpolation-1.13.jar;D:\install\mavenrepository\org\mongodb\mongo-java-driver\2.9.1\mongo-java-driver-2.9.1.jar" com.Test
-----------------------------------------------------------------
datanodeInfo	192.168.37.112:50010
getAdminState	In Service
getBlockPoolUsed	1536000
getBlockPoolUsed	1536000
getBlockPoolUsedPercent	0.0030464383
getCacheCapacity	0
getCacheUsed	0
getCapacity	50419531776
getDatanodeReport	Name: 192.168.37.112:50010 (hadoop02)
Hostname: hadoop02
Decommission Status : Normal
Configured Capacity: 50419531776 (46.96 GB)
DFS Used: 1536000 (1.46 MB)
Non DFS Used: 9452150784 (8.80 GB)
DFS Remaining: 40965844992 (38.15 GB)
DFS Used%: 0.00%
DFS Remaining%: 81.25%
Configured Cache Capacity: 0 (0 B)
Cache Used: 0 (0 B)
Cache Remaining: 0 (0 B)
Cache Used%: 100.00%
Cache Remaining%: 0.00%
Xceivers: 1
Last contact: Thu Sep 05 21:36:33 CST 2019

getDependentHostNames	[]
getDfsUsed	1536000
getName	192.168.37.112:50010
getNetworkLocation	/default-rack
getHostName	hadoop02
getParent	null
getClass	class org.apache.hadoop.hdfs.protocol.DatanodeInfo
getIpAddr	192.168.37.112
getInfoAddr	192.168.37.112:50075
getInfoPort	50075
-----------------------------------------------------------------
datanodeInfo	192.168.37.113:50010
getAdminState	In Service
getBlockPoolUsed	1536000
getBlockPoolUsed	1536000
getBlockPoolUsedPercent	0.0030464383
getCacheCapacity	0
getCacheUsed	0
getCapacity	50419531776
getDatanodeReport	Name: 192.168.37.113:50010 (hadoop03)
Hostname: hadoop03
Decommission Status : Normal
Configured Capacity: 50419531776 (46.96 GB)
DFS Used: 1536000 (1.46 MB)
Non DFS Used: 9408778240 (8.76 GB)
DFS Remaining: 41009217536 (38.19 GB)
DFS Used%: 0.00%
DFS Remaining%: 81.34%
Configured Cache Capacity: 0 (0 B)
Cache Used: 0 (0 B)
Cache Remaining: 0 (0 B)
Cache Used%: 100.00%
Cache Remaining%: 0.00%
Xceivers: 1
Last contact: Thu Sep 05 21:36:32 CST 2019

getDependentHostNames	[]
getDfsUsed	1536000
getName	192.168.37.113:50010
getNetworkLocation	/default-rack
getHostName	hadoop03
getParent	null
getClass	class org.apache.hadoop.hdfs.protocol.DatanodeInfo
getIpAddr	192.168.37.113
getInfoAddr	192.168.37.113:50075
getInfoPort	50075
-----------------------------------------------------------------
datanodeInfo	192.168.37.111:50010
getAdminState	In Service
getBlockPoolUsed	1536000
getBlockPoolUsed	1536000
getBlockPoolUsedPercent	0.0030464383
getCacheCapacity	0
getCacheUsed	0
getCapacity	50419531776
getDatanodeReport	Name: 192.168.37.111:50010 (hadoop01)
Hostname: hadoop01
Decommission Status : Normal
Configured Capacity: 50419531776 (46.96 GB)
DFS Used: 1536000 (1.46 MB)
Non DFS Used: 13512196096 (12.58 GB)
DFS Remaining: 36905799680 (34.37 GB)
DFS Used%: 0.00%
DFS Remaining%: 73.20%
Configured Cache Capacity: 0 (0 B)
Cache Used: 0 (0 B)
Cache Remaining: 0 (0 B)
Cache Used%: 100.00%
Cache Remaining%: 0.00%
Xceivers: 1
Last contact: Thu Sep 05 21:36:33 CST 2019

getDependentHostNames	[]
getDfsUsed	1536000
getName	192.168.37.111:50010
getNetworkLocation	/default-rack
getHostName	hadoop01
getParent	null
getClass	class org.apache.hadoop.hdfs.protocol.DatanodeInfo
getIpAddr	192.168.37.111
getInfoAddr	192.168.37.111:50075
getInfoPort	50075

Process finished with exit code 0