/**
* Copyright 2013 Cloudera Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.cloudera.cdk.examples.data;
import com.cloudera.cdk.data.Dataset;
import com.cloudera.cdk.data.DatasetDescriptor;
import com.cloudera.cdk.data.DatasetRepositories;
import com.cloudera.cdk.data.DatasetRepository;
import com.cloudera.cdk.data.DatasetWriter;
import java.util.Random;
import org.apache.avro.generic.GenericRecord;
import org.apache.avro.generic.GenericRecordBuilder;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
/**
* Create a dataset on the local filesystem and write some user objects to it,
* using Avro generic records.
*/
public class CreateUserDatasetGeneric extends Configured implements Tool {
@Override
public int run(String[] args) throws Exception {
// Construct a filesystem dataset repository rooted at /tmp/data
DatasetRepository repo = DatasetRepositories.open("repo:hdfs:/tmp/data");
// Create a dataset of users with the Avro schema in the repository
DatasetDescriptor descriptor = new DatasetDescriptor.Builder()
.schemaUri("resource:user.avsc")
.build();
Dataset<GenericRecord> users = repo.create("users", descriptor);
// Get a writer for the dataset and write some users to it
DatasetWriter<GenericRecord> writer = users.newWriter();
try {
writer.open();
String[] colors = { "green", "blue", "pink", "brown", "yellow" };
Random rand = new Random();
GenericRecordBuilder builder = new GenericRecordBuilder(descriptor.getSchema());
for (int i = 0; i < 100; i++) {
GenericRecord record = builder.set("username", "user-" + i)
.set("creationDate", System.currentTimeMillis())
.set("favoriteColor", colors[rand.nextInt(colors.length)]).build();
writer.write(record);
}
} finally {
writer.close();
}
return 0;
}
public static void main(String... args) throws Exception {
int rc = ToolRunner.run(new CreateUserDatasetGeneric(), args);
System.exit(rc);
}
}