Orc读写到obs

您想了解如何将ORC文件读取并写入到OBS中吗？

首先，您需要使用ORC读取程序来读取ORC文件。可以使用Apache ORC或Hive中的ORC读取器。接下来，您需要使用OBS SDK将数据写入OBS中。

以下是一个示例代码，可以将ORC文件读取并写入到OBS中：

import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hive.ql.io.orc.OrcFile;
import org.apache.hadoop.hive.ql.io.orc.Reader;
import org.apache.hadoop.hive.ql.io.orc.RecordReader;
import org.apache.hadoop.hive.ql.io.orc.StructObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.StructField;
import org.apache.hadoop.hive.serde2.objectinspector.StructTypeInfo;
import org.apache.hadoop.hive.serde2.typeinfo.TypeInfo;
import org.apache.hadoop.hive.serde2.typeinfo.TypeInfoFactory;
import org.apache.hadoop.hive.serde2.typeinfo.TypeInfoUtils;
import org.apache.hadoop.hive.serde2.typeinfo.TypeUtils;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.Writable;

import com.obs.services.ObsClient;
import com.obs.services.model.PutObjectRequest;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

public class OrcToOBS {

    public static void main(String[] args) throws IOException {

        // ORC文件路径
        String orcFilePath = "s3a://test-bucket/test-file.orc";
        // OBS桶名称
        String bucketName = "test-bucket";
        // OBS对象名称
        String objectName = "test-file.orc";

        // ORC读取器
        Reader reader = OrcFile.createReader(new Path(orcFilePath), OrcFile.readerOptions(FileSystem.get(new org.apache.hadoop.conf.Configuration())));

        // ORC数据信息
        StructTypeInfo orcTypeInfo = (StructTypeInfo) TypeInfoUtils.getTypeInfoFromTypeString(reader.getObjectInspector().getTypeName());

        // OBS客户端
        ObsClient obsClient = new ObsClient("<your access key>", "<your secret key>", "<your endpoint>");

        // OBS数据流
        InputStream inputStream = null;

        try {
            // OBS数据流
            inputStream = obsClient.getObject(bucketName, objectName).getObjectContent();

            // OBS上传请求
            PutObjectRequest putObjectRequest = new PutObjectRequest(bucketName, objectName);

            // ORC数据读取器
            RecordReader recordReader = reader.rows();

            // ORC字段信息
            StructObjectInspector inspector = (StructObjectInspector) reader.getObjectInspector();

            // ORC字段类型信息
            List<TypeInfo> typeInfos = orcTypeInfo.getAllStructFieldTypeInfos();

            // ORC字段名称
            List<String> fieldNames = new ArrayList<>();
            for (StructField field : inspector.getAllStructFieldRefs()) {
                fieldNames.add(field.getFieldName());
            }

            // ORC数据读取
            Object row = null;
            while (recordReader.hasNext()) {
                row = recordReader.next(row);
                List<Object> fields = inspector.getStructFieldsDataAsList(row);
                StringBuilder stringBuilder = new StringBuilder();
                for (int i = 0; i < fields.size(); i++) {
                    TypeInfo typeInfo = typeInfos.get(i);
                    Object field = fields.get(i);
                    if (field != null) {
                        if (typeInfo.getTypeName().equals(TypeInfoFactory.stringTypeInfo.getTypeName())) {
                            stringBuilder.append(field.toString());
                        } else {
                            stringBuilder.append(field.toString());
                        }
                    }
                    stringBuilder.append(",");
                }
                stringBuilder.deleteCharAt(stringBuilder.length() - 1);
                stringBuilder.append("\n");
                String data = stringBuilder.toString();
                // 写入OBS
                obsClient.putObject(bucketName, objectName, data.getBytes());
            }

            // OBS上传
            obsClient.putObject(putObjectRequest, inputStream);

        } finally {
            if (inputStream != null) {
                inputStream.close();
            }
            obsClient.close();
        }
    }
}

请注意，此示例仅供参考，您需要根据您的实际需求进行修改，例如更改ORC读取器和OBS SDK的版本，以及更改访问密钥和终端节点等信息。