HBase Client Api-batch Operations

The previous blog said that using the HBase client API to manipulate the records in the HBase table, today we look at how to use the API to bulk manipulate the data in the table.

Install the method in the previous blog if you update (Add/modify/delete) records in HBase, is an update by line, this method in processing a large number of update operations, performance is poor, fortunately in the HBase provides a Batch way to batch update the data table method. Let's see how to batch update by Table.batch () method

To use the batch mode of the Table for batch updating, we need to create a set of put operations that provides an array of object objects equal to the length of the put operation set, which is used to store the results of the operation. Then call "Table.batch" (Actions, results), and then look at the code snippet below.

    private void Batch () throws IOException {//CREATE TABLE ...

        Table table = connection.gettable (tablename.valueof (table_name));
        list<row> actions = new arraylist<row> ();
            for (int i = 0; i < 10000. i++) {Put on = new put (Bytes.tobytes ("Row_" + i));
            Put.addcolumn (Bytes.tobytes (column_family_base), Bytes.tobytes (Column_username), Bytes.tobytes ("user_" + i));
            Put.addcolumn (Bytes.tobytes (column_family_base), Bytes.tobytes (Column_password), Bytes.tobytes ("Password_" + i));
            Put.addcolumn (Bytes.tobytes (column_family_address), Bytes.tobytes (Column_home), Bytes.tobytes ("home_" + i));
            Put.addcolumn (Bytes.tobytes (column_family_address), Bytes.tobytes (Column_office), Bytes.tobytes ("Office_" + i));
        Actions.Add (Put);

        } object[] results = new object[actions.size ()];
        try {table.batch (actions, results); catch (Interruptedexception E) {e.printstacktrace ();
        } Scan Scan = new Scan ();
        Resultscanner Resultscanner = Table.getscanner (scan);
        Iterator<result> it = Resultscanner.iterator ();
            while (It.hasnext ()) {result result = It.next ();
        Printrow (result);

        } table.close (); Delete Table ...}

Complete example code is as follows

Package my.hbasestudy;
Import org.apache.hadoop.conf.Configuration;
Import org.apache.hadoop.hbase.HBaseConfiguration;
Import Org.apache.hadoop.hbase.TableName;
Import org.apache.hadoop.hbase.client.*;

Import org.apache.hadoop.hbase.util.Bytes;
Import java.io.IOException;
Import java.util.ArrayList;
Import Java.util.Iterator;

Import java.util.List;

    public class Testbatch {private static final String table_name = "user";
    private static final String column_family_base = "BASE";

    private static final String column_family_address = "Address";
    private static final String Column_username = "USERNAME";
    private static final String Column_password = "PASSWORD";
    private static final String Column_home = "Home";

    private static final String Column_office = "OFFICE";

    Private Connection Connection;
        public static void Main (string[] args) throws Exception {Configuration config = hbaseconfiguration.create (); Connection Connection = ConnectionFactory.createconnection (config);

        Long T1 = System.currenttimemillis ();
        Testbatch t = new Testbatch (connection);

        T.batch ();
        Long t2 = System.currenttimemillis ();

        System.out.println ("Time:" + (T2-T1));
    Connection.close ();
    Public Testbatch (Connection Connection) {this.connection = Connection;

        private void Batch () throws IOException {createtable ();

        Table table = connection.gettable (tablename.valueof (table_name));
        list<row> actions = new arraylist<row> ();
            for (int i = 0; i < 10000. i++) {Put on = new put (Bytes.tobytes ("Row_" + i));
            Put.addcolumn (Bytes.tobytes (column_family_base), Bytes.tobytes (Column_username), Bytes.tobytes ("user_" + i));
            Put.addcolumn (Bytes.tobytes (column_family_base), Bytes.tobytes (Column_password), Bytes.tobytes ("Password_" + i)); Put.addcolumn (Bytes.tobytes (column_family_address), ByteS.tobytes (Column_home), Bytes.tobytes ("home_" + i));
            Put.addcolumn (Bytes.tobytes (column_family_address), Bytes.tobytes (Column_office), Bytes.tobytes ("Office_" + i));
        Actions.Add (Put);

        } object[] results = new object[actions.size ()];
        try {table.batch (actions, results);
        catch (Interruptedexception e) {e.printstacktrace ();
        } Scan Scan = new Scan ();
        Resultscanner Resultscanner = Table.getscanner (scan);
        Iterator<result> it = Resultscanner.iterator ();
            while (It.hasnext ()) {result result = It.next ();
        Printrow (result);

        } table.close ();
    Deletetable ();

        private void CreateTable () throws IOException {Admin admin = connection.getadmin ();
                    try {tabledescriptor Tabledesc = Tabledescriptorbuilder.newbuilder (tablename.valueof (table_name)) . addcolumnfamily (COLUMNFAmilydescriptorbuilder.newbuilder (Bytes.tobytes (column_family_base)). Build (). addcolumnfamily (ColumnF
            Amilydescriptorbuilder.newbuilder (Bytes.tobytes (column_family_address)). Build ().
        Admin.createtable (TABLEDESC);
        finally {admin.close ();

        } private void Deletetable () throws IOException {Admin admin = connection.getadmin ();
            try {admin.disabletable (tablename.valueof (table_name));
        Admin.deletetable (TABLENAME.VALUEOF (table_name));
        finally {admin.close (); } private void Printrow (result result) {if (Bytes.tostring (Result.getrow ())!= null) {STR
            Ingbuilder sb = new StringBuilder ();
            Sb.append (Bytes.tostring (Result.getrow ()));
            Sb.append ("[");
 Sb.append ("base:username=" + bytes.tostring (Result.getvalue (bytes.tobytes ("base"), Bytes.tobytes ("username")));           Sb.append (", base:password=" + bytes.tostring (Result.getvalue (bytes.tobytes ("base"), Bytes.tobytes ("password"))
            ));
            Sb.append (", address:home=" + bytes.tostring (Result.getvalue (bytes.tobytes ("Address"), Bytes.tobytes ("Home"))); Sb.append (", address:office=" + bytes.tostring (Result.getvalue (bytes.tobytes ("Address"), Bytes.tobytes ("Office"))
            );
            Sb.append ("]");
        System.out.println (Sb.tostring ()); }
    }
}