Hbase - How to get column names in a table?

Question

I have several HBase tables with millions of rows, but just a few columns. I want to extract the column names for each table and save them in a separate file. What is the best way to do this? Thank.

Answer 1

This should save the column names in a file Hbase_table_columns.txton local (and not on hdf):

echo "scan 'table_name'" | $HBASE_HOME/bin/hbase shell | awk -F'=' '{print $2}' | awk -F ':' '{print $1}' > Hbase_table_columns.txt

This should save the column names in the console:

echo "scan 'table_name'" | $HBASE_HOME/bin/hbase shell | awk -F'=' '{print $2}' | awk -F ':' '{print $1}'

This should save the column names in a file Hbase_table_columns.txt, and print to the console:

echo "scan 'table_name'" | $HBASE_HOME/bin/hbase shell | awk -F'=' '{print $2}' | awk -F ':' '{print $1}' |tee Hbase_table_columns.txt

---

This should save / print column family:column name:

echo "scan 'table_name'" | $HBASE_HOME/bin/hbase shell | awk -F'=' '{print $2}'|tee Hbase_table_columns.txt

Answer 2

API- java Hbase client, HbaseAdmin, ...

package mytest;
import com.usertest.*;

import java.io.IOException;
import java.util.Date;
import java.util.HashSet;
import java.util.List;
import java.util.Set;


public class ListHbaseTablesAndColumns {
    public static void main(String[] args) {
        try {
            HbaseMetaData hbaseMetaData  =new HbaseMetaData();
            for(String hbaseTable:hbaseMetaData  .getTableNames(".*yourtables.*")){
                    for (String column : hbaseMetaData  .getColumns(hbaseTable, 10000)) {
                        System.out.println(hbaseTable + "," + column);
                    }

            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

---

HbaseMetaData..

package com.usertest;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.*;
import org.apache.hadoop.hbase.client.*;
import org.apache.hadoop.hbase.filter.PageFilter;

import java.io.IOException;
import java.util.*;
import java.util.regex.Pattern;

public class HbaseMetaData {
    private HBaseAdmin hBaseAdmin;
    private Configuration hBaseConfiguration;

    public HbaseMetaData () throws IOException {
        this.hBaseConfiguration = HBaseConfiguration.create();
        this.hBaseAdmin = new HBaseAdmin(hBaseConfiguration);
    }
/** get all Table names **/
    public List<String> getTableNames(String regex) throws IOException {
        Pattern pattern=Pattern.compile(regex);
        List<String> tableList = new ArrayList<String>();
        TableName[] tableNames=hBaseAdmin.listTableNames();
        for (TableName tableName:tableNames){
            if(pattern.matcher(tableName.toString()).find()){
                tableList.add(tableName.toString());
            }
        }
        return tableList;
    }
/** Get all columns **/
    public Set<String> getColumns(String hbaseTable) throws IOException {
        return getColumns(hbaseTable, 10000);
    }
/** get all columns from the table **/
    public Set<String> getColumns(String hbaseTable, int limitScan) throws IOException {
        Set<String> columnList = new TreeSet<String>();
        HTable hTable=new HTable(hBaseConfiguration, hbaseTable);
        Scan scan=new Scan();
        scan.setFilter(new PageFilter(limitScan));
        ResultScanner results = hTable.getScanner(scan);
        for(Result result:results){
            for(KeyValue keyValue:result.list()){
                columnList.add(
                        new String(keyValue.getFamily()) + ":" +
                                new String(keyValue.getQualifier())
                );
            }
        }
        return columnList;
    }
}