Basics of Hector & Cassandra

Táim ag obair le Cassandra-0.8.2. Táim ag obair leis an leagan is déanaí de Hector & Is é mo leagan java 1.6.0_26

Táim an-nua do Cassandra & Hector.

Cad tá mé ag iarraidh a dhéanamh: 1. ceangail le cassandra mar shampla ar fhreastalaí difriúil. Tá a fhios agam go bhfuil sé ag rith b / c Is féidir liom ssh trí mo chríochfort isteach sa bhfreastalaí atá ag rith an cháis Cassandra seo agus an CLI a rith le feidhmiúlacht iomlán. 2. ansin ba mhaith liom ceangal le spás eochracha & teaghlach colúin a chruthú agus ansin luach a chur leis an teaghlach colúin sin trí Hector.

Sílim gurb í an fhadhb atá agam ná go mb’fhéidir nach bhfuil an cás reatha seo de Cassandra ar an bhfreastalaí seo cumraithe chun a fháil orduithe nach bhfuil áitiúil. Sílim gurb é an chéad chéim eile a bheidh agam sampla áitiúil de Cassandra a chur ar an cpu a bhfuil mé ag obair air agus iarracht a dhéanamh é seo a dhéanamh go háitiúil. Cad a cheapann tú?

Seo mo chód Java:

import me.prettyprint.cassandra.serializers.StringSerializer;
import me.prettyprint.cassandra.service.CassandraHostConfigurator;
import me.prettyprint.hector.api.Cluster;
import me.prettyprint.hector.api.Keyspace;
import me.prettyprint.hector.api.ddl.ColumnFamilyDefinition;
import me.prettyprint.hector.api.ddl.ComparatorType;
import me.prettyprint.hector.api.factory.HFactory;
import me.prettyprint.hector.api.mutation.Mutator;

    public class MySample {


        public static void main(String[] args) {


            Cluster cluster = HFactory.getOrCreateCluster("Test Cluster", "xxx.xxx.x.41:9160");
            Keyspace keyspace =  HFactory.createKeyspace("apples", cluster);
            ColumnFamilyDefinition cf = HFactory.createColumnFamilyDefinition("apples","ColumnFamily2",ComparatorType.UTF8TYPE);
            StringSerializer stringSerializer = StringSerializer.get();
            Mutator<String> mutator = HFactory.createMutator(keyspace, stringSerializer);
            mutator.insert("jsmith", "Standard1", HFactory.createStringColumn("first", "John"));
}
}

Is é mo ERROR:

16:22:19,852  INFO CassandraHostRetryService:37 - Downed Host Retry service started with queue size -1 and retry delay 10s
16:22:20,136  INFO JmxMonitor:54 - Registering JMX me.prettyprint.cassandra.service_Test Cluster:ServiceType=hector,MonitorType=hector
Exception in thread "main" me.prettyprint.hector.api.exceptions.HInvalidRequestException: InvalidRequestException(why:Keyspace apples does not exist)
    at me.prettyprint.cassandra.connection.HThriftClient.getCassandra(HThriftClient.java:70)
    at me.prettyprint.cassandra.connection.HConnectionManager.operateWithFailover(HConnectionManager.java:226)
    at me.prettyprint.cassandra.service.KeyspaceServiceImpl.operateWithFailover(KeyspaceServiceImpl.java:131)
    at me.prettyprint.cassandra.service.KeyspaceServiceImpl.batchMutate(KeyspaceServiceImpl.java:102)
    at me.prettyprint.cassandra.service.KeyspaceServiceImpl.batchMutate(KeyspaceServiceImpl.java:108)
    at me.prettyprint.cassandra.model.MutatorImpl$3.doInKeyspace(MutatorImpl.java:222)
    at me.prettyprint.cassandra.model.MutatorImpl$3.doInKeyspace(MutatorImpl.java:219)
    at me.prettyprint.cassandra.model.KeyspaceOperationCallback.doInKeyspaceAndMeasure(KeyspaceOperationCallback.java:20)
    at me.prettyprint.cassandra.model.ExecutingKeyspace.doExecute(ExecutingKeyspace.java:85)
    at me.prettyprint.cassandra.model.MutatorImpl.execute(MutatorImpl.java:219)
    at me.prettyprint.cassandra.model.MutatorImpl.insert(MutatorImpl.java:59)
    at org.cassandra.examples.MySample.main(MySample.java:25)
Caused by: InvalidRequestException(why:Keyspace apples does not exist)
    at org.apache.cassandra.thrift.Cassandra$set_keyspace_result.read(Cassandra.java:5302)
    at org.apache.cassandra.thrift.Cassandra$Client.recv_set_keyspace(Cassandra.java:481)
    at org.apache.cassandra.thrift.Cassandra$Client.set_keyspace(Cassandra.java:456)
    at me.prettyprint.cassandra.connection.HThriftClient.getCassandra(HThriftClient.java:68)
    ... 11 more

Go raibh maith agat roimh ré as do chabhair.