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4¡¢kuduµÄ¹¤×÷»úÖÆ

4.1¡¢¸ÅÊö

1¡¢kuduÖ÷Òª½ÇÉ«·ÖΪmasterÓëtserver

2¡¢masterÖ÷Òª¸ºÔð:¹ÜÀíÔªÊý¾ÝÐÅÏ¢£¬¼àÌýserver£¬µ±serverå´»úºó¸ºÔðtabletµÄÖØ·ÖÅä

3¡¢tserverÖ÷Òª¸ºÔðtabletµÄ´æ´¢ÓëºÍÊý¾ÝµÄÔöɾ¸Ä²é

4.2 ÄÚ²¿ÊµÏÖÔ­Àíͼ

4.2¡¢¶ÁÁ÷³Ì

4.2.1¡¢¸ÅÊö

¿Í»§¶Ë½«Òª¶ÁÈ¡µÄÊý¾ÝÐÅÏ¢·¢Ë͸ømaster£¬master¶ÔÆä½øÐÐÒ»¶¨µÄУÑ飬±ÈÈç±íÊÇ·ñ´æÔÚ£¬×Ö¶ÎÊÇ·ñ´æÔÚ¡£Master·µ»ØÔªÊý¾ÝÐÅÏ¢¸øclient£¬È»ºóclientÓëtserver½¨Á¢Á¬½Ó£¬Í¨¹ýmetaDataÕÒµ½Êý¾ÝËùÔÚµÄRowSet£¬Ê×ÏȼÓÔØÄÚ´æÀïÃæµÄÊý¾Ý(MemRowSetÓëDeltMemStore),È»ºó¼ÓÔØ´ÅÅÌÀïÃæµÄÊý¾Ý£¬×îºó·µ»Ø×îÖÕÊý¾Ý¸øclient.

4.2.2¡¢Ïêϸ²½Öèͼ

4.2.3¡¢Ïêϸ²½Öè½âÎö

1¡¢¿Í»§¶ËmasterÇëÇó²éѯ±íÖ¸¶¨Êý¾Ý

2¡¢master¶ÔÇëÇó½øÐÐУÑ飬УÑé±íÊÇ·ñ´æÔÚ£¬schemaÖÐÊÇ·ñ´æÔÚÖ¸¶¨²éѯµÄ×ֶΣ¬Ö÷¼üÊÇ·ñ´æÔÚ

3¡¢masterͨ¹ý²éѯcatalog Table·µ»Ø±í£¬½«tablet¶ÔÓ¦µÄtserverÐÅÏ¢¡¢tserver״̬µÈÔªÊý¾ÝÐÅÏ¢·µ»Ø¸øclient

4¡¢clientÓëtserver½¨Á¢Á¬½Ó£¬Í¨¹ýmetaDataÕÒµ½primary key¶ÔÓ¦µÄRowSet¡£

5¡¢Ê×ÏȼÓÔØRowSetÄÚ´æÖÐMemRowSetÓëDeltMemStoreÖеÄÊý¾Ý

6¡¢È»ºó¼ÓÔØ´ÅÅÌÖеÄÊý¾Ý£¬Ò²¾ÍÊÇDiskRowSetÖеÄBaseDataÓëDeltFileÖеÄÊý¾Ý

7¡¢·µ»ØÊý¾Ý¸øClient

8¡¢¼ÌÐø4-7²½Ö裬ֱµ½Äõ½ËùÓÐÊý¾Ý·µ»Ø¸øclient

4.3¡¢InsertÁ÷³Ì

4.3.1¡¢¸ÅÊö

ClientÊ×ÏÈÁ¬½Ómaster£¬»ñȡԪÊý¾ÝÐÅÏ¢¡£È»ºóÁ¬½Ótserver£¬²éÕÒMemRowSetÓëDeltMemStoreÖÐÊÇ·ñ´æÔÚÏàͬprimary key£¬Èç¹û´æÔÚ£¬Ôò±¨´í;Èç¹û²»´æÔÚ£¬Ôò½«´ý²åÈëµÄÊý¾ÝдÈëWALÈÕÖ¾£¬È»ºó½«Êý¾ÝдÈëMemRowSet¡£

4.3.2¡¢Ïêϸ²½Öèͼ

4.3.3¡¢Ïêϸ²½Öè½âÎö

1¡¢clientÏòmasterÇëÇóԤд±íµÄÔªÊý¾ÝÐÅÏ¢

2¡¢master»á½øÐÐÒ»¶¨µÄУÑ飬±íÊÇ·ñ´æÔÚ£¬×Ö¶ÎÊÇ·ñ´æÔÚµÈ

3¡¢Èç¹ûmasterУÑéͨ¹ý£¬Ôò·µ»Ø±íµÄ·ÖÇø¡¢tabletÓëÆä¶ÔÓ¦µÄtserver¸øclient£»Èç¹ûУÑéʧ°ÜÔò±¨´í¸øclient¡£

4¡¢client¸ù¾Ýmaster·µ»ØµÄÔªÊý¾ÝÐÅÏ¢£¬½«ÇëÇó·¢Ë͸øtablet¶ÔÓ¦µÄtserver.

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6¡¢tserver»á½²Ð´ÇëÇóԤдµ½WALÈÕÖ¾£¬ÓÃÀ´serverå´»úºóµÄ»Ö¸´²Ù×÷

7¡¢½«Êý¾ÝдÈëÄÚ´æÖеÄMemRowSetÖУ¬Ò»µ©MemRowSetµÄ´óС´ïµ½1G»ò120sºó£¬MemRowSet»áflush³ÉÒ»¸ö»òDiskRowSet,ÓÃÀ´½«Êý¾Ý³Ö¾Ã»¯

8¡¢·µ»ØclientÊý¾Ý´¦ÀíÍê±Ï

4.4¡¢Êý¾Ý¸üÐÂÁ÷³Ì

4.4.1¡¢¸ÅÊö

ClientÊ×ÏÈÏòmasterÇëÇóÔªÊý¾Ý£¬È»ºó¸ù¾ÝÔªÊý¾ÝÌṩµÄtabletÐÅÏ¢£¬Á¬½Ótserver£¬¸ù¾ÝÊý¾ÝËù´¦Î»ÖõIJ»Í¬£¬Óв»Í¬µÄ²Ù×÷:ÔÚÄÚ´æMemRowSetÖеÄÊý¾Ý£¬»á½«¸üÐÂÐÅϢдÈëÊý¾ÝËùÔÚÐеÄmutationÁ´±íÖУ»ÔÚ´ÅÅÌÖеÄÊý¾Ý£¬»á½«¸üÐÂÐÅϢдÈëDeltMemStoreÖС£

4.4.2¡¢Ïêϸ²½Öèͼ

4.4.3¡¢Ïêϸ²½Öè½âÎö

1¡¢clientÏòmasterÇëÇóÔ¤¸üбíµÄÔªÊý¾Ý£¬Ê×ÏÈmaster»áУÑé±íÊÇ·ñ´æÔÚ£¬×Ö¶ÎÊÇ·ñ´æÔÚ£¬Èç¹ûУÑéͨ¹ýÔò»á·µ»Ø¸øclient±íµÄ·ÖÇø¡¢tablet¡¢tabletËùÔÚtserverÐÅÏ¢

2¡¢clientÏòtserver·¢Æð¸üÐÂÇëÇó

3¡¢½«¸üвÙ×÷ԤдÈçWALÈÕÖ¾£¬ÓÃÀ´ÔÚserverå´»úºóµÄÊý¾Ý»Ö¸´

4¡¢¸ù¾ÝtserverÖдý¸üеÄÊý¾ÝËù´¦Î»ÖõIJ»Í¬£¬Óв»Í¬µÄ´¦Àí·½Ê½:

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Èç¹ûÊý¾ÝÔÚDiskRowSetÖУ¬Ôò½«¸üÐÂÐÅϢдÈëDeltMemStoreÖУ¬DeltMemStore´ïµ½Ò»¶¨´óСºó»áflush³ÉDeltFile¡£

5¡¢¸üÐÂÍê±Ïºó·µ»ØÏûÏ¢¸øclient¡£

5¡¢KUDUµÄjava²Ù×÷

5.1¡¢µ¼ÈëÒÀÀµ

<dependency>
<groupId>org.apache.kudu</groupId>
<artifactId>kudu-client</artifactId>
<version>${kudu.version}</version>
<scope>test</scope>
</dependency>
<!--µ¼ÈëkuduµÄ¿Í»§¶Ë¹¤¾ß-->
<dependency>
<groupId>org.apache.kudu</groupId>
<artifactId>kudu-client-tools</artifactId>
<version>${kudu.version}</version>
</dependency>

5.2¡¢API

5.2.1¡¢±í´´½¨

/**
* ´´½¨±í
* @throws Exception
*/
public static void createTable() throws Exception{
//1¡¢´´½¨Ò»¸öclient
KuduClient client new KuduClientBuilder(KUDU_MASTER).build();
//2¡¢´´½¨schemaÐÅÏ¢
List<ColumnSchema> columns = new ArrayList<ColumnSchema>();
columns.add (new ColumnSchema.ColumnSchemaBuilder ("id", Type.INT32).key(true).nullable(false).build());
columns.add(new ColumnSchema.ColumnSchemaBuilder ("name", Type.STRING).key(false).nullable(false).build());
columns.add(new ColumnSchema.ColumnSchemaBuilder("age", Type.INT32).key(false).nullable(false).build());
Schema schema = new Schema(columns);
//3¡¢Ö¸¶¨·ÖÇø×Ö¶Î
List<String> partions = new ArrayList<String>();
partions.add("id");
//4¡¢Ö¸¶¨·ÖÇø·½Ê½Îªhash·ÖÇø¡¢6¸ö·ÖÇø£¬Ò»¸ö¸±±¾
CreateTableOptions options = new CreateTableOptions().addHashPartitions(partions, 6).setNumReplicas(1);
//5¡¢´´½¨±í£¬
client.createTable("person",schema,options);
client.close();
}

5.2.2¡¢Insert

/**
* ²åÈëÊý¾Ý
* @throws Exception
*/
public static void add() throws Exception{
//1¡¢´´½¨Ò»¸öclient
KuduClient client = new KuduClientBuilder(KUDU_MASTER).build();
//2¡¢´ò¿ª±í
KuduTable table = client.openTable("person");
//3¡¢´´½¨Ò»¸ösession»á»°
KuduSession session = client.newSession();
//4¡¢´´½¨²åÈë
Insert insert = table.newInsert();
//5¡¢Ö¸¶¨²åÈëÊý¾Ý
insert.getRow().addInt("id",1);
insert.getRow().addInt("age",18);
insert.getRow().addString("name","ÕÅÈý");
//6¡¢Ó¦ÓòåÈë
session.apply(insert);
session.close();
client.close();
}

5.2.3¡¢update

/**
* ¸üÐÂÊý¾Ý
* @throws Exception
*/
public static void update() throws Exception{
//1¡¢´´½¨kudu client
KuduClient client = new KuduClientBuilder (KUDU_MASTER).build();
//2¡¢´ò¿ª±í
KuduTable table = client.openTable ("person");
KuduSession session = client.newSession();
Update update = table.newUpdate();
update.getRow().addInt("id",1);
update.getRow().addString("name","ÀîËÄ");
session.apply(update);
session.flush();
session.close();
client.close();
}

5.2.4¡¢delete

/**
* ɾ³ýÊý¾Ý
* @throws Exception
*/
public static void delete() throws Exception{
//1¡¢´´½¨kudu client
KuduClient client = new KuduClientBuilder(KUDU_MASTER).build();
//2¡¢´ò¿ª±í
KuduTable table = client.openTable("person");
KuduSession session = client.newSession();
Delete delete = table.newDelete();
delete.getRow().addInt("id",1); session.apply(delete);
session.flush();
session.close();
client.close();
}

5.2.5¡¢query

/**
* Ìõ¼þ²éѯ select * from person where id=1
* @throws Exception
*/
public static void query() throws Exception{
//1¡¢´´½¨kudu client
KuduClient client = new KuduClientBuilder (KUDU_MASTER).build();
//2¡¢´ò¿ª±í
KuduTable table = client.openTable("person");
//3¡¢´´½¨scannerɨÃèÆ÷
KuduScanner.KuduScannerBuilder kuduScannerBuilder = client.newScannerBuilder(table);
//4¡¢´´½¨²éѯÌõ¼þ
KuduPredicate filter = KuduPredicate.newComparisonPredicate (table.getSchema( ).getColumn("id"), KuduPredicate.ComparisonOp.EQUAL, 1);
//5¡¢½«²éѯÌõ¼þ¼ÓÈëµ½scannerÖÐ
KuduScanner scanner = kuduScannerBuilder.addPredicate (filter).build();
//6¡¢»ñÈ¡²éѯ½á¹û
while (scanner.hasMoreRows()){
RowResultIterator rows = scanner.nextRows();
while (rows.hasNext()){
RowResult row = rows.next();
Integer id = row.getInt("id");
String name = row.getString("name");
int age = row.getInt ("age");
System.out.println (id+"---"+name+"---"+age);
}
}
//7¡¢¹Ø±Õclient
client.close();
}

 

 

   
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