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HBase Java programming example

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HBase Java programming example
HelloWorld.zip

  1. Package elementary;

  3. Import java. io. IOException;
  4. Import java. text. SimpleDateFormat;
  5. Import java. util. ArrayList;
  6. Import java. util. Date;
  7. Import java. util. List;
  8. Import java. util. concurrent. atomic. AtomicInteger;
  9. Import java. util. concurrent. ExecutorService;
  10. Import java. util. concurrent. Executors;
  11. Import java. util. concurrent. TimeUnit;

  13. Import org. apache. hadoop. conf. Configuration;
  14. Import org. apache. hadoop. hbase. Cell;
  15. Import org. apache. hadoop. hbase. HBaseConfiguration;
  16. Import org. apache. hadoop. hbase. HColumnDescriptor;
  17. Import org. apache. hadoop. hbase. HTableDescriptor;
  18. Import org. apache. hadoop. hbase. MasterNotRunningException;
  19. Import org. apache. hadoop. hbase. TableName;
  20. Import org. apache. hadoop. hbase. ZooKeeperConnectionException;
  21. Import org. apache. hadoop. hbase. client. Delete;
  22. Import org. apache. hadoop. hbase. client. Get;
  23. Import org. apache. hadoop. hbase. client. Admin;
  24. Import org. apache. hadoop. hbase. client. BufferedMutator;
  25. Import org. apache. hadoop. hbase. client. BufferedMutatorParams;
  26. Import org. apache. hadoop. hbase. client. Connection;
  27. Import org. apache. hadoop. hbase. client. ConnectionFactory;
  28. Import org. apache. hadoop. hbase. client. Table;
  29. Import org. apache. hadoop. hbase. client. Put;
  30. Import org. apache. hadoop. hbase. client. Result;
  31. Import org. apache. hadoop. hbase. client. resultworkflow;
  32. Import org. apache. hadoop. hbase. client. Scan;
  33. Import org. apache. hadoop. hbase. util. Bytes;
  34. Import org. apache. hadoop. util. ThreadUtil;

  36. Public class HelloWorld {
  37. Private static Configuration conf = null;
  38. Private static Connection conn = null;
  39. Private static Admin admin = null;
  40. Public static AtomicInteger count = new AtomicInteger ();

  42. /**
  43. * Initialization Configuration
  44. */
  45. Static {
  46. Conf = HBaseConfiguration. create ();
  47. // If no configuration file exists, you must remember the manual announcement.

  49. Conf. set ("hbase. zookeeper. quorum", "10.148.137.143 ");
  50. Conf. set ("hbase. zookeeper. property. clientPort", "2181 ");
  51. }

  53. Static {
  54. Try {
  55. Conn = ConnectionFactory. createConnection ();
  56. Admin = conn. getAdmin ();
  57. } Catch (IOException e ){
  58. E. printStackTrace ();
  59. }
  60. }

  62. Static public class MyThread extends Thread
  63. {
  64. Int _ start;
  65. String _ tablename;
  66. Connection conn;
  67. // BufferedMutator table;
  68. Table table;

  70. Public MyThread (int start, String tablename ){
  71. _ Start = start;
  72. _ Tablename = tablename;
  73. }

  75. Public void run (){
  76. String tablename = _ tablename;
  77. Thread current = Thread. currentThread ();
  78. Long thread_id = current. getId ();
  79. System. out. printf ("thread [% d] run \ n", thread_id );

  81. Try {
  82. Conn = ConnectionFactory. createConnection ();
  83. // BufferedMutatorParams params = new BufferedMutatorParams (TableName. valueOf (tablename ));
  84. // Params. writeBufferSize (1024*4 );
  85. // Table = conn. getBufferedMutator (params );
  86. Table = conn. getTable (TableName. valueOf (tablename ));

  88. For (int j = _ start; j <100; ++ j ){
  89. For (int I = 0; I <10000000; ++ I ){
  90. // Zkb_0_0
  91. String zkb = "zkb _" + String. valueOf (_ start) + "_" + String. valueOf (I );
  92. Put put = new Put (Bytes. toBytes (zkb ));
  93. Put. addColumn (Bytes. toBytes ("grade"), Bytes. toBytes ("field1"), Bytes. toBytes (String. valueOf (I + 0 )));
  94. Put. addColumn (Bytes. toBytes ("grade"), Bytes. toBytes ("field2"), Bytes. toBytes (String. valueOf (I + 1 )));
  95. Put. addColumn (Bytes. toBytes ("grade"), Bytes. toBytes ("field3"), Bytes. toBytes (String. valueOf (I + 2 )));
  96. Put. addColumn (Bytes. toBytes ("grade"), Bytes. toBytes ("field4"), Bytes. toBytes (String. valueOf (I + 3 )));
  97. Put. addColumn (Bytes. toBytes ("grade"), Bytes. toBytes ("field5"), Bytes. toBytes (String. valueOf (I + 4 )));
  98. Put. addColumn (Bytes. toBytes ("grade"), Bytes. toBytes ("field6"), Bytes. toBytes (String. valueOf (I + 5 )));
  99. Put. addColumn (Bytes. toBytes ("grade"), Bytes. toBytes ("field7"), Bytes. toBytes (String. valueOf (I + 6 )));
  100. Put. addColumn (Bytes. toBytes ("grade"), Bytes. toBytes ("field8"), Bytes. toBytes (String. valueOf (I + 7 )));
  101. Put. addColumn (Bytes. toBytes ("grade"), Bytes. toBytes ("field9"), Bytes. toBytes (String. valueOf (I + 8 )));
  102. Put. addColumn (Bytes. toBytes ("grade"), Bytes. toBytes ("field10"), Bytes. toBytes (String. valueOf (I + 9 )));
  103. Put. addColumn (Bytes. toBytes ("grade"), Bytes. toBytes ("field11"), Bytes. toBytes (String. valueOf (I + 10 )));
  104. Put. addColumn (Bytes. toBytes ("grade"), Bytes. toBytes ("field12"), Bytes. toBytes (String. valueOf (I + 11 )));
  105. Put. addColumn (Bytes. toBytes ("grade"), Bytes. toBytes ("field13"), Bytes. toBytes (String. valueOf (I + 12 )));
  106. Put. addColumn (Bytes. toBytes ("grade"), Bytes. toBytes ("field14"), Bytes. toBytes (String. valueOf (I + 13 )));
  107. Put. addColumn (Bytes. toBytes ("grade"), Bytes. toBytes ("field15"), Bytes. toBytes (String. valueOf (I + 14 )));
  108. // Table. mutate (put );
  109. Table. put (put );

  111. Int m = HelloWorld. count. incrementAndGet ();
  112. If (m % 10000 = 0 ){
  113. Date dt = new Date ();
  114. SimpleDateFormat sdf = new SimpleDateFormat ("yyyy-MM-dd HH: mm: ss aa ");
  115. String now = sdf. format (dt );
  116. System. out. printf ("[% s] thread [% d] m = % d, j = % d, I = % d \ n", now, thread_id, m, j, I );
  117. }
  118. }
  119. }

  121. System. out. printf ("thread [% d] over \ n", thread_id );
  122. }
  123. Catch (Exception e ){
  124. E. printStackTrace ();
  125. }
  126. }
  127. }

  129. /**
  130. * Create a table
  131. * @ Param tablename
  132. * @ Param cfs
  133. */
  134. Public static void createTable (String tablename, String [] cfs ){
  135. Try {
  136. If (admin. tableExists (TableName. valueOf (tablename ))){
  137. System. out. println ("table already exists! ");
  138. } Else {
  139. HTableDescriptor tableDesc = new HTableDescriptor (TableName. valueOf (tablename ));
  140. For (int I = 0; I <cfs. length; I ++ ){
  141. HColumnDescriptor desc = new HColumnDescriptor (cfs [I]);
  142. Desc. setMaxVersions (3650 );
  143. TableDesc. addFamily (desc );
  144. }

  146. Byte [] [] splitKeys = new byte [] [] {
  147. Bytes. toBytes ("zkb_0_0 "),
  148. Bytes. toBytes ("zkb_10_0 "),
  149. Bytes. toBytes ("zkb_20_0 "),
  150. Bytes. toBytes ("zkb_30_0 "),
  151. Bytes. toBytes ("zkb_40_0 "),
  152. Bytes. toBytes ("zkb_50_0 "),
  153. Bytes. toBytes ("zkb_60_0 "),
  154. Bytes. toBytes ("zkb_70_0 "),
  155. Bytes. toBytes ("zkb_80_0 "),
  156. Bytes. toBytes ("zkb_90_0 "),
  157. Bytes. toBytes ("zkb_100_0 ")
  158. };
  159. Admin. createTable (tableDesc, splitKeys );
  160. Admin. close ();
  161. System. out. println ("create table" + tablename + "OK .");
  162. }
  163. } Catch (MasterNotRunningException e ){
  164. E. printStackTrace ();
  165. } Catch (ZooKeeperConnectionException e ){
  166. E. printStackTrace ();
  167. } Catch (IOException e ){
  168. E. printStackTrace ();
  169. }
  170. }

  172. /**
  173. * Except tables
  174. * @ Param tablename
  175. */
  176. Public static void deleteTable (String tablename ){
  177. Try {
  178. // Connection conn = ConnectionFactory. createConnection ();
  179. // Admin admin = conn. getAdmin ();
  180. Admin. disableTable (TableName. valueOf (tablename ));
  181. Admin. deleteTable (TableName. valueOf (tablename ));
  182. System. out. println ("delete table" + tablename + "OK .");
  183. } Catch (IOException e ){
  184. E. printStackTrace ();
  185. }
  186. }

  188. /**
  189. * Just remove one item
  190. * @ Param tableName
  191. * @ Param rowKey
  192. */
  193. Public static void delRecord (String tableName, String rowKey ){
  194. Try {
  195. Table table = conn. getTable (TableName. valueOf (tableName ));

  197. List <Delete> list = new ArrayList <Delete> ();
  198. Delete del = new Delete (rowKey. getBytes ());
  199. List. add (del );
  200. Table. delete (list );
  201. System. out. println ("del recored" + rowKey + "OK .");
  202. } Catch (IOException e ){
  203. E. printStackTrace ();
  204. }
  205. }

  207. /**
  208. * Obtain a metadata
  209. * @ Param tableName
  210. * @ Param rowKey
  211. */
  212. Public static void getOneRecord (String tableName, String rowKey ){
  213. Try {
  214. Table table = conn. getTable (TableName. valueOf (tableName ));

  216. Get get = new Get (rowKey. getBytes ());
  217. Result rs = table. get (get );
  218. List <Cell> list = rs. listCells ();
  219. For (Cell cell: list ){
  220. System. out. print (new String (cell. getRowArray (), cell. getRowOffset (), cell. getRowLength () + "");
  221. System. out. print (new String (cell. getFamilyArray (), cell. getFamilyOffset (), cell. getFamilyLength () + ":");
  222. System. out. print (new String (cell. getQualifierArray (), cell. getQualifierOffset (), cell. getQualifierLength () + "");
  223. System. out. print (cell. getTimestamp () + "");
  224. System. out. print (new String (cell. getValueArray (), cell. getValueOffset (), cell. getValueLength () + "");
  225. System. out. println ("");
  226. }
  227. } Catch (IOException e ){
  228. E. printStackTrace ();
  229. }
  230. }

  232. /**
  233. * Retrieve all information
  234. * @ Param tableName
  235. */
  236. Public static void getAllRecord (String tableName ){
  237. Try {
  238. // Connection conn = ConnectionFactory. createConnection ();
  239. Table table = conn. getTable (TableName. valueOf (tableName ));

  241. Scan scan = new Scan ();
  242. Resultpartition = table. getpartition (scan );
  243. For (Result rs: resulttasks ){
  244. List <Cell> list = rs. listCells ();
  245. For (Cell cell: list ){
  246. System. out. print (new String (cell. getRowArray (), cell. getRowOffset (), cell. getRowLength () + "");
  247. System. out. print (new String (cell. getFamilyArray (), cell. getFamilyOffset (), cell. getFamilyLength () + ":");
  248. System. out. print (new String (cell. getQualifierArray (), cell. getQualifierOffset (), cell. getQualifierLength () + "");
  249. System. out. print (cell. getTimestamp () + "");
  250. System. out. print (new String (cell. getValueArray (), cell. getValueOffset (), cell. getValueLength () + "");
  251. System. out. println ("");
  252. }
  253. }
  254. } Catch (IOException e ){
  255. E. printStackTrace ();
  256. }
  257. }

  259. /**
  260. * Retrieve the Family ticket
  261. * @ Param tableName
  262. * @ Return
  263. */
  264. Public static ArrayList <String> getAllFamilyName (String tableName ){
  265. ArrayList <String> familyname_list = new ArrayList <String> ();
  266. Try {
  267. // Connection conn = ConnectionFactory. createConnection ();
  268. Table table = conn. getTable (TableName. valueOf (tableName ));

  270. HTableDescriptor htabledescriptor = table. getTableDescriptor ();
  271. HColumnDescriptor [] hdlist = htabledescriptor. getColumnFamilies ();
  272. For (int I = 0; I
  273. HColumnDescriptor hd = hdlist [I];
  274. Familyname_list.add (hd. getNameAsString ());
  275. }
  276. } Catch (IOException e ){
  277. E. printStackTrace ();
  278. }
  279. Return familyname_list;
  280. }

  282. // Java-cp HelloWorld. jar: 'ls lib/*. jar | awk '{printf ("% s:", $0)} ''elementary. HelloWorld 5
  283. Public static void main (String [] args ){
  284. System. out. println ("HelloWorldX ");
  285. If (args. length> 0)
  286. System. out. println (args [0]);

  288. Int start = 0;
  289. If (args. length> 1)
  290. Start = Integer. valueOf (args [1]);
  291. If (start <0)
  292. Start = 0;

  294. Int num_threads = 16;
  295. If (args. length> 2)
  296. Num_threads = Integer. valueOf (args [2]);

  298. Try {
  299. String tablename = "scores ";
  300. String [] familys = {"grade", "course "};
  301. HelloWorld. createTable (tablename, familys );

  303. // ExecutorService thread_pool = Executors. newSingleThreadExecutor ();
  304. ExecutorService thread_pool = Executors. newFixedThreadPool (num_threads );
  305. Thread [] pool = new HelloWorld. MyThread [80];
  306. For (int I = 0; I <pool. length; ++ I ){
  307. Pool [I] = new HelloWorld. MyThread (I, tablename );
  308. Thread_pool.execute (pool [I]);
  309. }

  311. Thread_pool.shutdown ();
  312. System. out. println ("over ");
  313. }
  314. Catch (Exception e ){
  315. E. printStackTrace ();
  316. }
  317. }

  319. }

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

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