本文通过代码示例向您介绍如何使用TableTunnel接口实现多线程上传。
import java.io.IOException;
import java.util.ArrayList;
import java.util.Date;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import com.aliyun.odps.Column;
import com.aliyun.odps.Odps;
import com.aliyun.odps.PartitionSpec;
import com.aliyun.odps.TableSchema;
import com.aliyun.odps.account.Account;
import com.aliyun.odps.account.AliyunAccount;
import com.aliyun.odps.data.Record;
import com.aliyun.odps.data.RecordWriter;
import com.aliyun.odps.tunnel.TableTunnel;
import com.aliyun.odps.tunnel.TunnelException;
import com.aliyun.odps.tunnel.TableTunnel.UploadSession;
class UploadThread implements Callable<Boolean> {
private long id;
private RecordWriter recordWriter;
private Record record;
private TableSchema tableSchema;
public UploadThread(long id, RecordWriter recordWriter, Record record,
TableSchema tableSchema) {
this.id = id;
this.recordWriter = recordWriter;
this.record = record;
this.tableSchema = tableSchema;
}
@Override
public Boolean call() {
for (int i = 0; i < tableSchema.getColumns().size(); i++) {
Column column = tableSchema.getColumn(i);
switch (column.getType()) {
case BIGINT:
record.setBigint(i, 1L);
break;
case BOOLEAN:
record.setBoolean(i, true);
break;
case DATETIME:
record.setDatetime(i, new Date());
break;
case DOUBLE:
record.setDouble(i, 0.0);
break;
case STRING:
record.setString(i, "sample");
break;
default:
throw new RuntimeException("Unknown column type: "
+ column.getType());
}
}
boolean success = true;
try {
for (int i = 0; i < 10; i++) {
recordWriter.write(record);
}
} catch (IOException e) {
success = false;
e.printStackTrace();
} finally {
recordWriter.close();
}
return success;
}
public class UploadThreadSample {
// 阿里云账号AccessKey拥有所有API的访问权限,风险很高。强烈建议您创建并使用RAM用户进行API访问或日常运维,请登录RAM控制台创建RAM用户
// 此处以把AccessKey 和 AccessKeySecret 保存在环境变量为例说明。您也可以根据业务需要,保存到配置文件里
// 强烈建议不要把 AccessKey 和 AccessKeySecret 保存到代码里,会存在密钥泄漏风险
private static String accessId = System.getenv("ALIBABA_CLOUD_ACCESS_KEY_ID");
private static String accessKey = System.getenv("ALIBABA_CLOUD_ACCESS_KEY_SECRET");
private static String odpsUrl = "<http://service.odps.aliyun.com/api>";
private static String project = "<your project>";
private static String table = "<your table name>";
private static String partition = "<your partition spec>";
private static int threadNum = 10;
public static void main(String args[]) {
Account account = new AliyunAccount(accessId, accessKey);
Odps odps = new Odps(account);
odps.setEndpoint(odpsUrl);
odps.setDefaultProject(project);
try {
TableTunnel tunnel = new TableTunnel(odps);
PartitionSpec partitionSpec = new PartitionSpec(partition);
UploadSession uploadSession = tunnel.createUploadSession(project,
table, partitionSpec);
System.out.println("Session Status is : "
+ uploadSession.getStatus().toString());
ExecutorService pool = Executors.newFixedThreadPool(threadNum);
ArrayList<Callable<Boolean>> callers = new ArrayList<Callable<Boolean>>();
for (int i = 0; i < threadNum; i++) {
RecordWriter recordWriter = uploadSession.openRecordWriter(i);
Record record = uploadSession.newRecord();
callers.add(new UploadThread(i, recordWriter, record,
uploadSession.getSchema()));
}
pool.invokeAll(callers);
pool.shutdown();
Long[] blockList = new Long[threadNum];
for (int i = 0; i < threadNum; i++)
blockList[i] = Long.valueOf(i);
uploadSession.commit(blockList);
System.out.println("upload success!");
} catch (TunnelException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
说明
对于Tunnel Endpoint,支持指定或者不指定。
如果指定,按照指定的Endpoint下载。
如果不指定,默认按照ODPS Endpoint对应的Tunnel Endpoint(或配置的独享资源组)进行下载。
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