Apache Iceberg 是一个通用的数据表格式，可在不同的存储后端（如 Hadoop HDFS，Amazon S3 和 Google Cloud Storage）上运行。在使用 GCS 进行数据迁移时，需要使用原子重命名操作来确保数据的一致性和持久性。以下是使用 Java 代码实现 Apache Iceberg 在 GCS 上的原子重命名操作的示例：

import com.google.cloud.storage.BlobInfo;
import com.google.cloud.storage.Storage;
import com.google.cloud.storage.StorageOptions;
import org.apache.iceberg.common.DynMethods;
import org.apache.iceberg.util.Tasks;

import java.util.UUID;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.stream.Collectors;
import java.util.stream.Stream;

public class GcsAtomicRename implements Callable {

  private static final int MAX_RETRIES = 8;
  private static final int INITIAL_BACKOFF_MS = 100;

  private final String container;
  private final String containerPath;
  private final String srcPath;
  private final String dstPath;

  public GcsAtomicRename(String container, String containerPath, String srcPath, String dstPath) {
    this.container = container;
    this.containerPath = containerPath;
    this.srcPath = srcPath;
    this.dstPath = dstPath;
  }

  @Override
  public Void call() throws Exception {
    Storage storage = StorageOptions.getDefaultInstance().getService();
    String randomId = UUID.randomUUID().toString();

    BlobInfo srcBlob = BlobInfo.newBuilder(container, containerPath + "/" + srcPath).build();
    BlobInfo dstBlob = BlobInfo.newBuilder(container, containerPath + "/." + randomId + "._" + dstPath).build();

    boolean copied;

    do {
      copied = storage.copy(srcBlob, dstBlob).getContent() != null;
    } while (!copied);

    Tasks.foreach(Stream.generate(() -> null)
        .limit(MAX_RETRIES)
        .collect(Collectors.toList()))
        .retry(MAX_RETRIES)
        .exponentialBackoff(INITIAL_BACKOFF_MS, 2.0)
        .onlyRetryOn(ExecutionException.class)
        .run(ignore -> {
          storage.delete(srcBlob.getBlobId