pace_03
2022-04-19 21:05
采纳率: 72%
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已结题

Hbase在ubuntu20.04下配置伪分布式,eclipse创建连接失败

hadoop3.1.3 Hbase1.1.5
hadoop与hbase运行正常,jps截图如下:

img

hbase-site.xml配置如下:Master031902623是我在hosts文件配置好的主机名

img

报错日志如下:

log4j:WARN No appenders could be found for logger (org.apache.hadoop.metrics2.lib.MutableMetricsFactory).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
java.io.IOException: java.lang.reflect.InvocationTargetException
    at org.apache.hadoop.hbase.client.ConnectionFactory.createConnection(ConnectionFactory.java:240)
    at org.apache.hadoop.hbase.client.ConnectionFactory.createConnection(ConnectionFactory.java:218)
    at org.apache.hadoop.hbase.client.ConnectionFactory.createConnection(ConnectionFactory.java:119)
    at test.init(test.java:36)
    at test.createTable(test.java:59)
    at test.main(test.java:24)
Caused by: java.lang.reflect.InvocationTargetException
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:77)
    at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499)
    at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:480)
    at org.apache.hadoop.hbase.client.ConnectionFactory.createConnection(ConnectionFactory.java:238)
    ... 5 more
Caused by: java.lang.UnsupportedOperationException: Constructor threw an exception for org.apache.hadoop.hbase.ipc.RpcClientImpl
    at org.apache.hadoop.hbase.util.ReflectionUtils.instantiate(ReflectionUtils.java:54)
    at org.apache.hadoop.hbase.util.ReflectionUtils.instantiateWithCustomCtor(ReflectionUtils.java:34)
    at org.apache.hadoop.hbase.ipc.RpcClientFactory.createClient(RpcClientFactory.java:64)
    at org.apache.hadoop.hbase.ipc.RpcClientFactory.createClient(RpcClientFactory.java:48)
    at org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.<init>(ConnectionManager.java:638)
    ... 11 more
Caused by: java.lang.reflect.InvocationTargetException
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:77)
    at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499)
    at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:480)
    at org.apache.hadoop.hbase.util.ReflectionUtils.instantiate(ReflectionUtils.java:46)
    ... 15 more
Caused by: java.lang.ExceptionInInitializerError
    at org.apache.hadoop.hbase.ipc.IPCUtil.<init>(IPCUtil.java:74)
    at org.apache.hadoop.hbase.ipc.AbstractRpcClient.<init>(AbstractRpcClient.java:95)
    at org.apache.hadoop.hbase.ipc.RpcClientImpl.<init>(RpcClientImpl.java:1092)
    at org.apache.hadoop.hbase.ipc.RpcClientImpl.<init>(RpcClientImpl.java:1118)
    ... 21 more
Caused by: java.lang.RuntimeException: Unexpected version format: 17.0.1
    at org.apache.hadoop.hbase.util.ClassSize.<clinit>(ClassSize.java:119)
    ... 25 more
Exception in thread "main" java.lang.NullPointerException: Cannot invoke "org.apache.hadoop.hbase.client.Admin.tableExists(org.apache.hadoop.hbase.TableName)" because "test.admin" is null
    at test.createTable(test.java:61)
    at test.main(test.java:24)

编写的代码如下,参考的教材的源码,电子资源:http://dblab.xmu.edu.cn/blog/1593-2/

//省略导包
public class test{
    public static Configuration configuration;
    public static Connection connection;
    public static Admin admin;
    public static void main(String[] args)throws IOException{
        createTable("t2",new String[]{"cf1","cf2"});
        insertRow("t2", "rw1", "cf1", "q1", "val1");
        getData("t2", "rw1", "cf1", "q1");
        //deleteTable("t2");  //如果不想执行本行代码,可以注释掉本行代码
    } 
    //建立连接
    public static void init(){
        configuration  = HBaseConfiguration.create();
        configuration.set("hbase.rootdir","hdfs://Master031902623:9000/hbase");

        try{
            connection = ConnectionFactory.createConnection(configuration);
            admin = connection.getAdmin();
            Connection hbaseConn = ConnectionFactory.createConnection(HBaseConfiguration.create());
            Admin admin = hbaseConn.getAdmin();
        }catch (IOException e){
            e.printStackTrace();
        }
    }
    //关闭连接
    public static void close(){
        try{
            if(admin != null){
                admin.close();
            }
            if(null != connection){
                connection.close();
            }
        }catch (IOException e){
            e.printStackTrace();
        }
    }
     //建表
    public static void createTable(String myTableName,String[] colFamily) throws IOException { 
        init();
        TableName tableName = TableName.valueOf(myTableName); 
        if(admin.tableExists(tableName)){
            System.out.println("talbe is exists!");
        }else {
            HTableDescriptor hTableDescriptor = new HTableDescriptor(tableName);
            for(String str:colFamily){
                HColumnDescriptor hColumnDescriptor = new HColumnDescriptor(str);
                hTableDescriptor.addFamily(hColumnDescriptor);
            }
            admin.createTable(hTableDescriptor);
        }
        close();
    }
    //删表
    public static void deleteTable(String tableName) throws IOException {
        init();
        TableName tn = TableName.valueOf(tableName);
        if (admin.tableExists(tn)) {
            admin.disableTable(tn);
            admin.deleteTable(tn);
        }
        close();
    } 
    //查看已有表
    public static void listTables() throws IOException {
        init();
        HTableDescriptor hTableDescriptors[] = admin.listTables();
        for(HTableDescriptor hTableDescriptor :hTableDescriptors){
            System.out.println(hTableDescriptor.getNameAsString());
        }
        close();
    }
    public static void insertRow(String tableName,String rowKey,String colFamily,String col,String val) throws IOException {
        init();
        Table table = connection.getTable(TableName.valueOf(tableName));
        Put put = new Put(rowKey.getBytes());
        put.addColumn(colFamily.getBytes(), col.getBytes(), val.getBytes());
        table.put(put);
        table.close();
        close();
    }
    //删除数据
    public static void deleteRow(String tableName,String rowKey,String colFamily,String col) throws IOException {
        init();
        Table table = connection.getTable(TableName.valueOf(tableName));
        Delete delete = new Delete(rowKey.getBytes());
        //删除指定列族
        //delete.addFamily(Bytes.toBytes(colFamily));
        //删除指定列
        //delete.addColumn(Bytes.toBytes(colFamily),Bytes.toBytes(col));
        table.delete(delete);
        table.close();
        close();
    }
    //根据rowkey查找数据
    public static void getData(String tableName,String rowKey,String colFamily,String col)throws  IOException{
        init();
        Table table = connection.getTable(TableName.valueOf(tableName));
        Get get = new Get(rowKey.getBytes());
        get.addColumn(colFamily.getBytes(),col.getBytes());
        Result result = table.get(get);
        showCell(result);
        table.close();
        close();
    }
    //格式化输出
    public static void showCell(Result result){
        Cell[] cells = result.rawCells();
        for(Cell cell:cells){
            System.out.println("RowName:"+new String(CellUtil.cloneRow(cell))+" ");
            System.out.println("Timetamp:"+cell.getTimestamp()+" ");
            System.out.println("column Family:"+new String(CellUtil.cloneFamily(cell))+" ");
            System.out.println("row Name:"+new String(CellUtil.cloneQualifier(cell))+" ");
            System.out.println("value:"+new String(CellUtil.cloneValue(cell))+" ");
        }
    }
}
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