1 | /** |
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2 | * Program: HBaseRecordPro.java |
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3 | * Editor: Waue Chen |
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4 | * From : NCHC. Taiwn |
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5 | * Last Update Date: 07/02/2008 |
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6 | * Upgrade to 0.17 |
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7 | */ |
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8 | |
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9 | /** |
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10 | * Purpose : |
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11 | * First, program would parse your record and create Hbase.\ |
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12 | * Then it sets the first line as column qualify \ |
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13 | * Finally it stores in HBase automatically. |
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14 | * |
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15 | * HowToUse : |
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16 | * Make sure two thing : |
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17 | * 1. source_file must be regular as follow: |
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18 | * first line: qualify1:qualify2:...:qualifyN |
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19 | * other line: records1:records2:...:recordsN |
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20 | * (the number N of qualify must be the same as records ) |
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21 | ----------------- |
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22 | name:locate:years |
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23 | waue:taiwan:1981 |
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24 | rock:taiwan:1981 |
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25 | aso:taiwan:1981 |
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26 | jazz:taiwan:1982 |
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27 | ----------------- |
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28 | * 2. source_file path must be correct. |
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29 | |
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30 | * Check Result: |
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31 | * Go to hbase console, type : |
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32 | * hql > select * from t1_table; |
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33 | 08/06/06 12:20:48 INFO hbase.HTable: Creating scanner over t1_table starting at key |
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34 | |
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35 | +-------------------------+-------------------------+-------------------------+ |
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36 | | Row | Column | Cell | |
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37 | +-------------------------+-------------------------+-------------------------+ |
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38 | | 0 | member:locate | taiwan | |
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39 | +-------------------------+-------------------------+-------------------------+ |
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40 | | 0 | member:name | waue | |
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41 | +-------------------------+-------------------------+-------------------------+ |
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42 | | 0 | member:years | 1981 | |
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43 | +-------------------------+-------------------------+-------------------------+ |
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44 | | 17 | member:locate | taiwan | |
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45 | +-------------------------+-------------------------+-------------------------+ |
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46 | | 17 | member:name | rock | |
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47 | +-------------------------+-------------------------+-------------------------+ |
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48 | | 17 | member:years | 1981 | |
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49 | +-------------------------+-------------------------+-------------------------+ |
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50 | | 34 | member:locate | taiwan | |
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51 | +-------------------------+-------------------------+-------------------------+ |
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52 | | 34 | member:name | aso | |
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53 | +-------------------------+-------------------------+-------------------------+ |
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54 | | 34 | member:years | 1981 | |
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55 | +-------------------------+-------------------------+-------------------------+ |
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56 | | 50 | member:locate | taiwan | |
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57 | +-------------------------+-------------------------+-------------------------+ |
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58 | | 50 | member:name | jazz | |
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59 | +-------------------------+-------------------------+-------------------------+ |
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60 | | 50 | member:years | 1982 | |
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61 | +-------------------------+-------------------------+-------------------------+ |
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62 | 4 row(s) in set. (0.31 sec) |
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63 | |
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64 | */ |
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65 | |
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66 | package tw.org.nchc.code; |
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67 | |
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68 | import java.io.BufferedReader; |
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69 | import java.io.BufferedWriter; |
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70 | import java.io.File; |
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71 | import java.io.FileReader; |
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72 | import java.io.FileWriter; |
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73 | import java.io.IOException; |
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74 | import java.util.Iterator; |
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75 | |
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76 | import org.apache.hadoop.fs.FileSystem; |
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77 | import org.apache.hadoop.fs.Path; |
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78 | import org.apache.hadoop.hbase.io.ImmutableBytesWritable; |
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79 | import org.apache.hadoop.hbase.mapred.TableReduce; |
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80 | import org.apache.hadoop.io.LongWritable; |
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81 | import org.apache.hadoop.io.MapWritable; |
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82 | import org.apache.hadoop.io.Text; |
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83 | import org.apache.hadoop.mapred.JobClient; |
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84 | import org.apache.hadoop.mapred.JobConf; |
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85 | import org.apache.hadoop.mapred.OutputCollector; |
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86 | import org.apache.hadoop.mapred.Reporter; |
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87 | import org.apache.hadoop.mapred.lib.IdentityMapper; |
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88 | import org.apache.hadoop.mapred.lib.IdentityReducer; |
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89 | |
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90 | public class HBaseRecordPro { |
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91 | /* Major parameter */ |
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92 | // it indicates local path, not hadoop file system path |
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93 | final static String source_file = "/home/waue/test.txt"; |
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94 | |
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95 | /* Minor parameter */ |
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96 | // column family name |
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97 | final static String column_family = "member:"; |
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98 | |
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99 | // table name |
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100 | final static String table_name = "HBaseRecord"; |
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101 | |
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102 | // separate char |
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103 | final static String sp = ":"; |
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104 | |
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105 | // conf tmp with column qualify |
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106 | final static String conf_tmp = "/tmp/HBaseRecordPro.firstLine.tmp"; |
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107 | |
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108 | // data source tmp |
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109 | final static String text_tmp = "/tmp/HBaseRecord.text.tmp"; |
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110 | |
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111 | // on this sample, map is nonuse, we use reduce to handle |
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112 | private static class ReduceClass extends TableReduce<LongWritable, Text> { |
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113 | public void reduce(LongWritable key, Iterator<Text> values, |
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114 | OutputCollector<Text, MapWritable> output, Reporter reporter) |
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115 | throws IOException { |
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116 | |
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117 | // read the configure file |
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118 | BufferedReader fconf = new BufferedReader(new FileReader(new File( |
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119 | conf_tmp))); |
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120 | String first_line = fconf.readLine(); |
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121 | fconf.close(); |
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122 | // extract cf data |
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123 | String[] cf = first_line.split(sp); |
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124 | int length = cf.length; |
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125 | |
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126 | // values.next().getByte() can get value and transfer to byte form, |
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127 | String stro = new String(values.next().getBytes()); |
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128 | String str[] = stro.split(sp); |
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129 | |
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130 | // Column id is created dymanically, |
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131 | Text[] col_n = new Text[length]; |
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132 | byte[][] b_l = new byte[length][]; |
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133 | // contents must be ImmutableBytesWritable |
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134 | ImmutableBytesWritable[] w_l = new ImmutableBytesWritable[length]; |
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135 | |
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136 | // This map connect to hbase table and holds the columns per row |
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137 | MapWritable map = new MapWritable(); |
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138 | map.clear(); |
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139 | |
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140 | // prepare to write data into map |
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141 | for (int i = 0; i < length; i++) { |
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142 | col_n[i] = new Text(column_family + cf[i]); |
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143 | b_l[i] = str[i].getBytes(); |
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144 | w_l[i] = new ImmutableBytesWritable(b_l[i]); |
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145 | // populate the current row |
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146 | map.put(col_n[i], w_l[i]); |
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147 | } |
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148 | // add the row with the key as the row id |
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149 | output.collect(new Text(key.toString()), map); |
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150 | } |
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151 | } |
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152 | |
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153 | public HBaseRecordPro() { |
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154 | } |
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155 | |
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156 | // This function can split the source text into two file, \ |
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157 | // conf_tmp file recorded first line is used to set column qualify \ |
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158 | // text_tmp , ou, recorded data is used to store into table. |
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159 | public String parseFirstLine(String in, String ou) |
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160 | throws IOException { |
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161 | |
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162 | BufferedReader fi = new BufferedReader(new FileReader(new File(in))); |
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163 | BufferedWriter ff = new BufferedWriter(new FileWriter(new File(conf_tmp))); |
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164 | BufferedWriter fw = new BufferedWriter(new FileWriter(new File(ou))); |
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165 | String first_line, data; |
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166 | first_line = fi.readLine(); |
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167 | ff.write(first_line); |
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168 | ff.flush(); |
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169 | do { |
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170 | data = fi.readLine(); |
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171 | if (data == null) { |
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172 | break; |
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173 | } else { |
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174 | fw.write(data + "\n"); |
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175 | fw.flush(); |
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176 | } |
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177 | } while (true); |
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178 | fw.close(); |
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179 | ff.close(); |
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180 | return first_line; |
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181 | } |
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182 | // tmp file delete |
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183 | boolean deleteFile(String str)throws IOException{ |
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184 | File df = new File(str); |
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185 | |
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186 | if(df.exists()){ |
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187 | if(!df.delete()){ |
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188 | System.err.print("delete file error !"); |
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189 | } |
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190 | }else{ |
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191 | System.out.println("file not exit!"); |
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192 | } |
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193 | return true; |
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194 | } |
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195 | /** |
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196 | * Runs the demo. |
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197 | */ |
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198 | public static void main(String[] args) throws IOException { |
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199 | |
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200 | HBaseRecordPro setup = new HBaseRecordPro(); |
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201 | String[] col_family = {column_family}; |
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202 | Path text_path = new Path(text_tmp); |
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203 | |
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204 | setup.parseFirstLine(source_file, text_tmp); |
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205 | // System.out.println(first_line); |
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206 | |
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207 | BuildHTable build_table = new BuildHTable(table_name, |
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208 | col_family); |
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209 | if (!build_table.checkTableExist(table_name)) { |
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210 | if (!build_table.createTable()) { |
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211 | System.out.println("create table error !"); |
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212 | } |
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213 | } else { |
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214 | System.out.println("Table \"" + table_name |
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215 | + "\" has already existed !"); |
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216 | } |
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217 | JobConf conf = new JobConf(HBaseRecordPro.class); |
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218 | FileSystem fileconf = FileSystem.get(conf); |
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219 | fileconf.copyFromLocalFile(true, text_path, text_path); |
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220 | // Job name; you can modify to any you like |
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221 | conf.setJobName("PersonDataBase"); |
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222 | final int mapTasks = 1; |
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223 | final int reduceTasks = 1; |
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224 | // Hbase table name must be correct , in our profile is t1_table |
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225 | TableReduce.initJob(table_name, ReduceClass.class, conf); |
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226 | |
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227 | // below are map-reduce profile |
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228 | conf.setNumMapTasks(mapTasks); |
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229 | conf.setNumReduceTasks(reduceTasks); |
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230 | // 0.16 |
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231 | // conf.setInputPath(text_path); |
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232 | Convert.setInputPath(conf, text_path); |
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233 | |
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234 | conf.setMapperClass(IdentityMapper.class); |
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235 | conf.setCombinerClass(IdentityReducer.class); |
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236 | conf.setReducerClass(ReduceClass.class); |
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237 | |
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238 | JobClient.runJob(conf); |
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239 | |
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240 | // delete tmp file |
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241 | // 0.16 |
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242 | // FileSystem.get(conf).delete(text_path); |
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243 | FileSystem.get(conf).delete(text_path,true); |
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244 | |
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245 | setup.deleteFile(conf_tmp); |
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246 | } |
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247 | } |
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