9、Elasticsearch7.6.1 ES与HDFS相互转存数据-ES-Hadoop

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Elasticsearch 系列文章

1、介绍lucene的功能以及建立索引、搜索单词、搜索词语和搜索句子四个示例实现

2、Elasticsearch7.6.1基本介绍、2种部署方式及验证、head插件安装、分词器安装及验证

3、Elasticsearch7.6.1信息搜索示例（索引操作、数据操作-添加、删除、导入等、数据搜索及分页）

4、Elasticsearch7.6.1 Java api操作ES（CRUD、两种分页方式、高亮显示）和Elasticsearch SQL详细示例

5、Elasticsearch7.6.1 filebeat介绍及收集kafka日志到es示例

6、Elasticsearch7.6.1、logstash、kibana介绍及综合示例（ELK、grok插件）

7、Elasticsearch7.6.1收集nginx日志及监测指标示例

8、Elasticsearch7.6.1收集mysql慢查询日志及监控

9、Elasticsearch7.6.1 ES与HDFS相互转存数据-ES-Hadoop

文章目录

Elasticsearch 系列文章
一、ES-Hadoop介绍
二、ES写入HDFS

1、txt文件格式写入

1）、pom.xml
2）、示例1：order_idx
3）、示例2：tomcat_log_2023-03
2、json文件格式写入
三、HDFS写入ES

1、txt文件写入

2、json文件写入

本文简单的介绍了ES-hadoop组件功能使用，即通过ES-hadoop实现相互数据写入示例。

本文依赖es环境、hadoop环境好用。

本文分为三部分，即ES-hadoop介绍、ES数据写入hadoop和hadoop数据写入ES。

一、ES-Hadoop介绍

ES-Hadoop是Elasticsearch推出的专门用于对接Hadoop生态的工具，可以让数据在Elasticsearch和Hadoop之间双向移动，无缝衔接Elasticsearch与Hadoop服务，充分使用Elasticsearch的快速搜索及Hadoop批处理能力，实现交互式数据处理。

本文介绍如何通过ES-Hadoop实现Hadoop的Hive服务读写Elasticsearch数据。

Hadoop生态的优势是处理大规模数据集，但是其缺点也很明显，就是当用于交互式分析时，查询时延会比较长。而Elasticsearch擅长于交互式分析，对于很多查询类型，特别是对于Ad-hoc查询（即席查询），可以达到秒级。ES-Hadoop的推出提供了一种组合两者优势的可能性。使用ES-Hadoop，您只需要对代码进行很小的改动，即可快速处理存储在Elasticsearch中的数据，并且能够享受到Elasticsearch带来的加速效果。

ES-Hadoop的原理是将Elasticsearch作为MR、Spark或Hive等数据处理引擎的数据源，在计算存储分离的架构中扮演存储的角色。这和 MR、Spark或Hive的数据源并无差异，但相对于这些数据源，Elasticsearch具有更快的数据选择过滤能力。这种能力正是分析引擎最为关键的能力之一。

9、Elasticsearch7.6.1 ES与HDFS相互转存数据-ES-Hadoop,在这里插入图片描述,第1张

二、ES写入HDFS

假设es中已经存储具体索引数据，下面仅仅是将es的数据读取并存入hdfs中。

9、Elasticsearch7.6.1 ES与HDFS相互转存数据-ES-Hadoop,在这里插入图片描述,第2张

9、Elasticsearch7.6.1 ES与HDFS相互转存数据-ES-Hadoop,在这里插入图片描述,第3张

1、txt文件格式写入

1）、pom.xml

	
        org.elasticsearch
        elasticsearch-hadoop
        7.6.1
    
    
        org.elasticsearch.client
        transport
        7.6.1
    
    
        org.apache.hadoop
        hadoop-common
        3.1.4
    
    
        org.apache.hadoop
        hadoop-client
        3.1.4
    
    
        org.apache.hadoop
        hadoop-hdfs
        3.1.4
    
    
        jdk.tools
        jdk.tools
        1.8
        system
        ${JAVA_HOME}/lib/tools.jar
    
    
        org.apache.hadoop
        hadoop-mapreduce-client-core
        3.1.4
    
    
    
        commons-httpclient
        commons-httpclient
        3.1
    
    
    
        com.google.code.gson
        gson
        2.10.1

2）、示例1：order_idx

将ES中的order_idx索引数据存储至hdfs中，其中hdfs是HA。hdfs中是以txt形式存储的，其中数据用逗号隔离

其数据结构

key 5000，value {status=已付款, pay_money=3820.0, payway=3, userid=4405460,operation_date=2020-04-25 12:09:51, category=维修;手机;}

实现

import java.io.IOException;
import java.util.Iterator;
import java.util.Map;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
import org.elasticsearch.hadoop.mr.EsInputFormat;
import org.elasticsearch.hadoop.mr.LinkedMapWritable;
import lombok.Data;
import lombok.extern.slf4j.Slf4j;
@Slf4j
public class ESToHdfs extends Configured implements Tool {
    private static String out = "/ES-Hadoop/test";
    public static void main(String[] args) throws Exception {
        Configuration conf = new Configuration();
        int status = ToolRunner.run(conf, new ESToHdfs(), args);
        System.exit(status);
    }
    static class ESToHdfsMapper extends Mapper {
        Text outValue = new Text();
        protected void map(Text key, LinkedMapWritable value, Context context) throws IOException, InterruptedException {
//            log.info("key {} , value {}", key.toString(), value);
            Order order = new Order();
//            order.setId(Integer.parseInt(key.toString()));
            Iterator it = value.entrySet().iterator();
            order.setId(key.toString());
            String name = null;
            String data = null;
            while (it.hasNext()) {
                Map.Entry entry = (Map.Entry) it.next();
                name = entry.getKey().toString();
                data = entry.getValue().toString();
                switch (name) {
                case "userid":
                    order.setUserid(Integer.parseInt(data));
                    break;
                case "operation_date":
                    order.setOperation_date(data);
                    break;
                case "category":
                    order.setCategory(data);
                    break;
                case "pay_money":
                    order.setPay_money(Double.parseDouble(data));
                    break;
                case "status":
                    order.setStatus(data);
                    break;
                case "payway":
                    order.setPayway(data);
                    break;
                }
            }
            //log.info("order={}", order);
            outValue.set(order.toString());
            context.write(NullWritable.get(), outValue);
        }
    }
    @Data
    static class Order {
        // key 5000 value {status=已付款, pay_money=3820.0, payway=3, userid=4405460, operation_date=2020-04-25 12:09:51, category=维修;手机;}
        private String id;
        private int userid;
        private String operation_date;
        private String category;
        private double pay_money;
        private String status;
        private String payway;
        public String toString() {
            return new StringBuilder(id).append(",").append(userid).append(",").append(operation_date).append(",").append(category).append(",").append(pay_money).append(",")
                    .append(status).append(",").append(payway).toString();
        }
    }
    @Override
    public int run(String[] args) throws Exception {
        Configuration conf = getConf();
        conf.set("fs.defaultFS", "hdfs://HadoopHAcluster");
        conf.set("dfs.nameservices", "HadoopHAcluster");
        conf.set("dfs.ha.namenodes.HadoopHAcluster", "nn1,nn2");
        conf.set("dfs.namenode.rpc-address.HadoopHAcluster.nn1", "server1:8020");
        conf.set("dfs.namenode.rpc-address.HadoopHAcluster.nn2", "server2:8020");
        conf.set("dfs.client.failover.proxy.provider.HadoopHAcluster", "org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider");
        System.setProperty("HADOOP_USER_NAME", "alanchan");
        conf.setBoolean("mapred.map.tasks.speculative.execution", false);
        conf.setBoolean("mapred.reduce.tasks.speculative.execution", false);
        conf.set("es.nodes", "server1:9200,server2:9200,server3:9200");
        // ElaticSearch 索引名称
        conf.set("es.resource", "order_idx");
        // 查询索引中的所有数据，也可以加条件          
        conf.set("es.query", "{       \"query\": {\"match_all\": {  }}}");
        Job job = Job.getInstance(conf, ESToHdfs.class.getName());
        // 设置作业驱动类
        job.setJarByClass(ESToHdfs.class);
        // 设置ES的输入类型
        job.setInputFormatClass(EsInputFormat.class);
        job.setMapperClass(ESToHdfsMapper.class);
        job.setMapOutputKeyClass(NullWritable.class);
        job.setMapOutputValueClass(Text.class);
        FileOutputFormat.setOutputPath(job, new Path(out));
        job.setNumReduceTasks(0);
        return job.waitForCompletion(true) ? 0 : 1;
    }
}

验证

结果如下图

9、Elasticsearch7.6.1 ES与HDFS相互转存数据-ES-Hadoop,在这里插入图片描述,第4张

3）、示例2：tomcat_log_2023-03

将ES中的tomcat_log_2023-03索引数据存储至hdfs中，其中hdfs是HA。hdfs中是以txt形式存储的，其中数据用逗号隔离

其数据结构

key Uzm_44YBH2rQ2w9r5vqK , value {message=2023-03-15 13:30:00.001 [schedulerJobAllTask_Worker-1] INFO c.o.d.s.t.QuartzTask.executeAllTaskList-{37} - 生成消息记录任务停止执行结束*******, tags=[_dateparsefailure], class=c.o.d.s.t.QuartzTask.executeAllTaskList-{37}, level=INFO, date=2023-03-15 13:30:00.001, thread=schedulerJobAllTask_Worker-1, fields={source=catalina}, @timestamp=2023-03-15T05:30:06.812Z, log={file={path=/opt/apache-tomcat-9.0.43/logs/catalina.out}, offset=76165371}, info=- 生成消息记录任务停止执行结束*******}

实现

import java.io.IOException;
import java.util.Iterator;
import java.util.Map;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
import org.elasticsearch.hadoop.mr.EsInputFormat;
import org.elasticsearch.hadoop.mr.LinkedMapWritable;
import lombok.Data;
import lombok.extern.slf4j.Slf4j;
@Slf4j
public class ESToHdfs2 extends Configured implements Tool {
    private static String out = "/ES-Hadoop/tomcatlog";
    static class ESToHdfs2Mapper extends Mapper {
        Text outValue = new Text();
        protected void map(Text key, LinkedMapWritable value, Context context) throws IOException, InterruptedException {
//            log.info("key {} , value {}", key.toString(), value);
            TomcatLog tLog = new TomcatLog();
            Iterator it = value.entrySet().iterator();
            String name = null;
            String data = null;
            while (it.hasNext()) {
                Map.Entry entry = (Map.Entry) it.next();
                name = entry.getKey().toString();
                data = entry.getValue().toString();
                switch (name) {
                case "date":
                    tLog.setDate(data.replace('/', '-'));
                    break;
                case "thread":
                    tLog.setThread(data);
                    break;
                case "level":
                    tLog.setLogLevel(data);
                    break;
                case "class":
                    tLog.setClazz(data);
                    break;
                case "info":
                    tLog.setLogMsg(data);
                    break;
                }
            }
            outValue.set(tLog.toString());
            context.write(NullWritable.get(), outValue);
        }
    }
    @Data
    static class TomcatLog {
        private String date;
        private String thread;
        private String logLevel;
        private String clazz;
        private String logMsg;
        public String toString() {
            return new StringBuilder(date).append(",").append(thread).append(",").append(logLevel).append(",").append(clazz).append(",").append(logMsg).toString();
        }
    }
    public static void main(String[] args) throws Exception {
        Configuration conf = new Configuration();
        int status = ToolRunner.run(conf, new ESToHdfs2(), args);
        System.exit(status);
    }
    @Override
    public int run(String[] args) throws Exception {
        Configuration conf = getConf();
        conf.set("fs.defaultFS", "hdfs://HadoopHAcluster");
        conf.set("dfs.nameservices", "HadoopHAcluster");
        conf.set("dfs.ha.namenodes.HadoopHAcluster", "nn1,nn2");
        conf.set("dfs.namenode.rpc-address.HadoopHAcluster.nn1", "server1:8020");
        conf.set("dfs.namenode.rpc-address.HadoopHAcluster.nn2", "server2:8020");
        conf.set("dfs.client.failover.proxy.provider.HadoopHAcluster", "org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider");
        System.setProperty("HADOOP_USER_NAME", "alanchan");
        conf.setBoolean("mapred.map.tasks.speculative.execution", false);
        conf.setBoolean("mapred.reduce.tasks.speculative.execution", false);
        conf.set("es.nodes", "server1:9200,server2:9200,server3:9200");
        // ElaticSearch 索引名称
        conf.set("es.resource", "tomcat_log_2023-03");
        conf.set("es.query", "{\"query\":{\"bool\":{\"must\":[{\"match_all\":{}}],\"must_not\":[],\"should\":[]}},\"from\":0,\"size\":10,\"sort\":[],\"aggs\":{}}");
        Job job = Job.getInstance(conf, ESToHdfs2.class.getName());
        // 设置作业驱动类
        job.setJarByClass(ESToHdfs2.class);
        job.setInputFormatClass(EsInputFormat.class);
        job.setMapperClass(ESToHdfs2Mapper.class);
        job.setMapOutputKeyClass(NullWritable.class);
        job.setMapOutputValueClass(Text.class);
        FileOutputFormat.setOutputPath(job, new Path(out));
        job.setNumReduceTasks(0);
        return job.waitForCompletion(true) ? 0 : 1;
    }
}

验证

9、Elasticsearch7.6.1 ES与HDFS相互转存数据-ES-Hadoop,在这里插入图片描述,第5张

2、json文件格式写入

将ES中的tomcat_log_2023-03索引数据存储至hdfs中，其中hdfs是HA。hdfs中是以json形式存储的

其数据结构

key Uzm_44YBH2rQ2w9r5vqK , value {message=2023-03-15 13:30:00.001 [schedulerJobAllTask_Worker-1] INFO c.o.d.s.t.QuartzTask.executeAllTaskList-{37} - 生成消息记录任务停止执行结束*******, tags=[_dateparsefailure], class=c.o.d.s.t.QuartzTask.executeAllTaskList-{37}, level=INFO, date=2023-03-15 13:30:00.001, thread=schedulerJobAllTask_Worker-1, fields={source=catalina}, @timestamp=2023-03-15T05:30:06.812Z, log={file={path=/opt/apache-tomcat-9.0.43/logs/catalina.out}, offset=76165371}, info=- 生成消息记录任务停止执行结束*******}

实现

import java.io.IOException;
import java.util.Iterator;
import java.util.Map;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
import org.elasticsearch.hadoop.mr.EsInputFormat;
import org.elasticsearch.hadoop.mr.LinkedMapWritable;
import com.google.gson.Gson;
import lombok.Data;
  
public class ESToHdfsByJson extends Configured implements Tool {
    private static String out = "/ES-Hadoop/tomcatlog_json";
    public static void main(String[] args) throws Exception {
        Configuration conf = new Configuration();
        int status = ToolRunner.run(conf, new ESToHdfsByJson(), args);
        System.exit(status);
    }
    @Override
    public int run(String[] args) throws Exception {
        Configuration conf = getConf();
        conf.set("fs.defaultFS", "hdfs://HadoopHAcluster");
        conf.set("dfs.nameservices", "HadoopHAcluster");
        conf.set("dfs.ha.namenodes.HadoopHAcluster", "nn1,nn2");
        conf.set("dfs.namenode.rpc-address.HadoopHAcluster.nn1", "server1:8020");
        conf.set("dfs.namenode.rpc-address.HadoopHAcluster.nn2", "server2:8020");
        conf.set("dfs.client.failover.proxy.provider.HadoopHAcluster", "org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider");
        System.setProperty("HADOOP_USER_NAME", "alanchan");
        conf.setBoolean("mapred.map.tasks.speculative.execution", false);
        conf.setBoolean("mapred.reduce.tasks.speculative.execution", false);
        conf.set("es.nodes", "server1:9200,server2:9200,server3:9200");
        // ElaticSearch 索引名称
        conf.set("es.resource", "tomcat_log_2023-03");
        conf.set("es.query", "{\"query\":{\"bool\":{\"must\":[{\"match_all\":{}}],\"must_not\":[],\"should\":[]}},\"from\":0,\"size\":10,\"sort\":[],\"aggs\":{}}");
        Job job = Job.getInstance(conf, ESToHdfs2.class.getName());
        // 设置作业驱动类
        job.setJarByClass(ESToHdfsByJson.class);
        job.setInputFormatClass(EsInputFormat.class);
        job.setMapperClass(ESToHdfsByJsonMapper.class);
        job.setMapOutputKeyClass(NullWritable.class);
        job.setMapOutputValueClass(Text.class);
        FileOutputFormat.setOutputPath(job, new Path(out));
        job.setNumReduceTasks(0);
        return job.waitForCompletion(true) ? 0 : 1;
    }
    static class ESToHdfsByJsonMapper extends Mapper {
        Text outValue = new Text();
        private Gson gson = new Gson();
        
        protected void map(Text key, LinkedMapWritable value, Context context) throws IOException, InterruptedException {
//            log.info("key {} , value {}", key.toString(), value);
            TomcatLog tLog = new TomcatLog();
//            tLog.setId(key.toString());
            Iterator it = value.entrySet().iterator();
            String name = null;
            String data = null;
            while (it.hasNext()) {
                Map.Entry entry = (Map.Entry) it.next();
                name = entry.getKey().toString();
                data = entry.getValue().toString();
                switch (name) {
                case "date":
                    tLog.setDate(data.replace('/', '-'));
                    break;
                case "thread":
                    tLog.setThread(data);
                    break;
                case "level":
                    tLog.setLogLevel(data);
                    break;
                case "class":
                    tLog.setClazz(data);
                    break;
                case "info":
                    tLog.setLogMsg(data);
                    break;
                }
            }
            outValue.set(gson.toJson(tLog));
            context.write(NullWritable.get(), outValue);
        }
    }
    @Data
    static class TomcatLog {
//        private String id ;
        private String date;
        private String thread;
        private String logLevel;
        private String clazz;
        private String logMsg;
    }
}

验证

9、Elasticsearch7.6.1 ES与HDFS相互转存数据-ES-Hadoop,在这里插入图片描述,第6张

三、HDFS写入ES

本示例以上述例子中存入hdfs的数据。经过测试，ES只能将json的数据导入。

pom.xml参考上述例子

1、txt文件写入

先将数据转换成json后存入

import java.io.IOException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
import org.elasticsearch.hadoop.mr.EsOutputFormat;
import com.google.gson.Gson;
import lombok.Data;
import lombok.extern.slf4j.Slf4j;
@Slf4j
public class HdfsTxtDataToES extends Configured implements Tool {
    private static String out = "/ES-Hadoop/tomcatlog";
    public static void main(String[] args) throws Exception {
        Configuration conf = new Configuration();
        int status = ToolRunner.run(conf, new HdfsTxtDataToES(), args);
        System.exit(status);
    }
    @Data
    static class TomcatLog {
        private String date;
        private String thread;
        private String logLevel;
        private String clazz;
        private String logMsg;
    }
    @Override
    public int run(String[] args) throws Exception {
        Configuration conf = getConf();
        conf.set("fs.defaultFS", "hdfs://HadoopHAcluster");
        conf.set("dfs.nameservices", "HadoopHAcluster");
        conf.set("dfs.ha.namenodes.HadoopHAcluster", "nn1,nn2");
        conf.set("dfs.namenode.rpc-address.HadoopHAcluster.nn1", "server1:8020");
        conf.set("dfs.namenode.rpc-address.HadoopHAcluster.nn2", "server2:8020");
        conf.set("dfs.client.failover.proxy.provider.HadoopHAcluster", "org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider");
        System.setProperty("HADOOP_USER_NAME", "alanchan");
        conf.setBoolean("mapred.map.tasks.speculative.execution", false);
        conf.setBoolean("mapred.reduce.tasks.speculative.execution", false);
        conf.set("es.nodes", "server1:9200,server2:9200,server3:9200");
        // ElaticSearch 索引名称，可以不提前创建
        conf.set("es.resource", "tomcat_log_2024");
        // Hadoop上的数据格式为JSON,可以直接导入
        conf.set("es.input.json", "yes");
        Job job = Job.getInstance(conf, HdfsTxtDataToES.class.getName());
        // 设置作业驱动类
        job.setJarByClass(HdfsTxtDataToES.class);
        // 设置EsOutputFormat
        job.setOutputFormatClass(EsOutputFormat.class);
        job.setMapperClass(HdfsTxtDataToESMapper.class);
        job.setMapOutputKeyClass(NullWritable.class);
        job.setMapOutputValueClass(Text.class);
        FileInputFormat.setInputPaths(job, new Path(out));
        job.setNumReduceTasks(0);
        return job.waitForCompletion(true) ? 0 : 1;
    }
    static class HdfsTxtDataToESMapper extends Mapper {
        Text outValue = new Text();
        TomcatLog tLog = new TomcatLog();
        Gson gson = new Gson();
        protected void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException {
            log.info("key={},value={}", key, value);
            // date:2023-03-13 17:33:00.001,
            // thread:schedulerJobAllTask_Worker-1,
            // loglevel:INFO,
            // clazz:o.q.c.QuartzScheduler.start-{461},
            // logMsg:- Scheduler DefaultQuartzScheduler_$_NON_CLUSTERED started.
            String[] lines = value.toString().split(",");
            tLog.setDate(lines[0]);
            tLog.setThread(lines[1]);
            tLog.setLogLevel(lines[2]);
            tLog.setClazz(lines[3]);
            tLog.setLogMsg(lines[4]);
            outValue.set(gson.toJson(tLog));
            context.write(NullWritable.get(), outValue);
        }
    }
}

2、json文件写入

import java.io.IOException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
import org.elasticsearch.hadoop.mr.EsOutputFormat;
import lombok.extern.slf4j.Slf4j;
@Slf4j
public class HdfsJsonDataToES extends Configured implements Tool {
    private static String out = "/ES-Hadoop/tomcatlog_json";
    public static void main(String[] args) throws Exception {
        Configuration conf = new Configuration();
        int status = ToolRunner.run(conf, new HdfsJsonDataToES(), args);
        System.exit(status);
    }
    @Override
    public int run(String[] args) throws Exception {
        Configuration conf = getConf();
        conf.set("fs.defaultFS", "hdfs://HadoopHAcluster");
        conf.set("dfs.nameservices", "HadoopHAcluster");
        conf.set("dfs.ha.namenodes.HadoopHAcluster", "nn1,nn2");
        conf.set("dfs.namenode.rpc-address.HadoopHAcluster.nn1", "server1:8020");
        conf.set("dfs.namenode.rpc-address.HadoopHAcluster.nn2", "server2:8020");
        conf.set("dfs.client.failover.proxy.provider.HadoopHAcluster", "org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider");
        System.setProperty("HADOOP_USER_NAME", "alanchan");
        conf.setBoolean("mapred.map.tasks.speculative.execution", false);
        conf.setBoolean("mapred.reduce.tasks.speculative.execution", false);
        conf.set("es.nodes", "server1:9200,server2:9200,server3:9200");
        // ElaticSearch 索引名称，可以不提前创建
        conf.set("es.resource", "tomcat_log_2023");
        //Hadoop上的数据格式为JSON,可以直接导入
        conf.set("es.input.json", "yes");
        
        Job job = Job.getInstance(conf, HdfsJsonDataToES.class.getName());
        // 设置作业驱动类
        job.setJarByClass(HdfsJsonDataToES.class);
        job.setOutputFormatClass(EsOutputFormat.class);
        job.setMapperClass(HdfsJsonDataToESMapper.class);
        job.setMapOutputKeyClass(NullWritable.class);
        job.setMapOutputValueClass(Text.class);
        FileInputFormat.setInputPaths(job, new Path(out));
        job.setNumReduceTasks(0);
        return job.waitForCompletion(true) ? 0 : 1;
    }
    static class HdfsJsonDataToESMapper extends Mapper {
        protected void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException {
            log.info("key={},value={}",key,value);
            context.write(NullWritable.get(), value);
        }
    }
}

以上，简单的介绍了ES-hadoop组件功能使用，即通过ES-hadoop实现相互数据写入示例。

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9、Elasticsearch7.6.1 ES与HDFS相互转存数据-ES-Hadoop

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文章目录

一、ES-Hadoop介绍

二、ES写入HDFS

1、txt文件格式写入

1）、pom.xml

2）、示例1：order_idx

3）、示例2：tomcat_log_2023-03

2、json文件格式写入

三、HDFS写入ES

1、txt文件写入

2、json文件写入

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