package client;
// cc DeleteListExample Example application deleting data from HBase
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.client.Delete;
import org.apache.hadoop.hbase.client.HTable;
import org.apache.hadoop.hbase.util.Bytes;
import util.HBaseHelper;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
public class DeleteListExample {
public static void main(String[] args) throws IOException {
Configuration conf = HBaseConfiguration.create();
HBaseHelper helper = HBaseHelper.getHelper(conf);
helper.dropTable("testtable");
helper.createTable("testtable", "colfam1", "colfam2");
HTable table = new HTable(conf, "testtable");
helper.put("testtable",
new String[] { "row1" },
new String[] { "colfam1", "colfam2" },
new String[] { "qual1", "qual1", "qual2", "qual2", "qual3", "qual3" },
new long[] { 1, 2, 3, 4, 5, 6 },
new String[] { "val1", "val2", "val3", "val4", "val5", "val6" });
helper.put("testtable",
new String[] { "row2" },
new String[] { "colfam1", "colfam2" },
new String[] { "qual1", "qual1", "qual2", "qual2", "qual3", "qual3" },
new long[] { 1, 2, 3, 4, 5, 6 },
new String[] { "val1", "val2", "val3", "val4", "val5", "val6" });
helper.put("testtable",
new String[] { "row3" },
new String[] { "colfam1", "colfam2" },
new String[] { "qual1", "qual1", "qual2", "qual2", "qual3", "qual3" },
new long[] { 1, 2, 3, 4, 5, 6 },
new String[] { "val1", "val2", "val3", "val4", "val5", "val6" });
System.out.println("Before delete call...");
helper.dump("testtable", new String[]{ "row1", "row2", "row3" }, null, null);
// vv DeleteListExample
List<Delete> deletes = new ArrayList<Delete>(); // co DeleteListExample-1-CreateList Create a list that holds the Delete instances.
Delete delete1 = new Delete(Bytes.toBytes("row1"));
delete1.setTimestamp(4); // co DeleteListExample-2-SetTS Set timestamp for row deletes.
deletes.add(delete1);
Delete delete2 = new Delete(Bytes.toBytes("row2"));
delete2.deleteColumn(Bytes.toBytes("colfam1"), Bytes.toBytes("qual1")); // co DeleteListExample-3-DelColNoTS Delete the latest version only in one column.
delete2.deleteColumns(Bytes.toBytes("colfam2"), Bytes.toBytes("qual3"), 5); // co DeleteListExample-4-DelColsTS Delete the given and all older versions in another column.
deletes.add(delete2);
Delete delete3 = new Delete(Bytes.toBytes("row3"));
delete3.deleteFamily(Bytes.toBytes("colfam1")); // co DeleteListExample-5-AddCol Delete entire family, all columns and versions.
delete3.deleteFamily(Bytes.toBytes("colfam2"), 3); // co DeleteListExample-6-AddCol Delete the given and all older versions in the entire column family, i.e., from all columns therein.
deletes.add(delete3);
table.delete(deletes); // co DeleteListExample-7-DoDel Delete the data from multiple rows the HBase table.
table.close();
// ^^ DeleteListExample
System.out.println("After delete call...");
helper.dump("testtable", new String[]{ "row1", "row2", "row3" }, null, null);
}
}