nsivabalan commented on code in PR #13126: URL: https://github.com/apache/hudi/pull/13126#discussion_r2040300584
########## hudi-aws/src/main/java/org/apache/hudi/aws/transaction/lock/S3StorageLockClient.java: ########## @@ -0,0 +1,248 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you 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 org.apache.hudi.aws.transaction.lock; + +import org.apache.hudi.aws.credentials.HoodieAWSCredentialsProviderFactory; +import org.apache.hudi.client.transaction.lock.models.LockGetResult; +import org.apache.hudi.client.transaction.lock.models.LockUpdateResult; +import org.apache.hudi.client.transaction.lock.StorageLock; +import org.apache.hudi.client.transaction.lock.models.StorageLockData; +import org.apache.hudi.client.transaction.lock.models.StorageLockFile; +import org.apache.hudi.common.util.VisibleForTesting; +import org.apache.hudi.common.util.collection.Pair; + +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; +import software.amazon.awssdk.awscore.exception.AwsServiceException; +import software.amazon.awssdk.core.ResponseInputStream; +import software.amazon.awssdk.core.exception.SdkClientException; +import software.amazon.awssdk.core.sync.RequestBody; +import software.amazon.awssdk.regions.Region; +import software.amazon.awssdk.regions.providers.DefaultAwsRegionProviderChain; +import software.amazon.awssdk.services.s3.S3Client; +import software.amazon.awssdk.services.s3.model.GetObjectRequest; +import software.amazon.awssdk.services.s3.model.GetObjectResponse; +import software.amazon.awssdk.services.s3.model.PutObjectRequest; +import software.amazon.awssdk.services.s3.model.PutObjectResponse; +import software.amazon.awssdk.services.s3.model.S3Exception; + +import javax.annotation.concurrent.ThreadSafe; + +import java.io.IOException; +import java.io.UncheckedIOException; +import java.util.Properties; +import java.util.function.Supplier; + +/** + * S3-based distributed lock service using ETag checks (AWS SDK v2). + * See RFC: <a href="https://github.com/apache/hudi/blob/master/rfc/rfc-91/rfc-91.md";>RFC-91</a> + */ +@ThreadSafe +public class S3StorageLockClient implements StorageLock { + + private static final Logger LOG = LoggerFactory.getLogger(S3StorageLockClient.class); + private static final long WAIT_TIME_FOR_RETRY_MS = 1000L; + private static final int PRECONDITION_FAILURE_ERROR_CODE = 412; + private static final int NOT_FOUND_ERROR_CODE = 404; + private static final int CONDITIONAL_REQUEST_CONFLICT_ERROR_CODE = 409; + private static final int RATE_LIMIT_ERROR_CODE = 429; + private static final int INTERNAL_SERVER_ERROR_CODE_MIN = 500; + + private final Logger logger; + private final S3Client s3Client; + private final String bucketName; + private final String lockFilePath; + private final String ownerId; + + /** Constructor that is used by reflection to instantiate an S3-based storage locking client. + * @param ownerId The owner id. + * @param bucketName The name of the bucket. + * @param lockFilePath The path within the bucket where to write lock files. + * @param props The properties for the lock config, can be used to customize client. + */ + public S3StorageLockClient(String ownerId, String bucketName, String lockFilePath, Properties props) { + this( + ownerId, + bucketName, + lockFilePath, + createDefaultS3Client(props), + LOG); + } + + @VisibleForTesting + S3StorageLockClient(String ownerId, + String bucketName, + String lockFilePath, + S3Client s3Client, + Logger logger) { + this.s3Client = s3Client; + this.lockFilePath = lockFilePath; + this.bucketName = bucketName; + this.ownerId = ownerId; + this.logger = logger; + } + + private static S3Client createDefaultS3Client(Properties props) { + Region region; + try { + region = DefaultAwsRegionProviderChain.builder().build().getRegion(); + } catch (SdkClientException e) { + // Fallback to us-east-1 if no region is found + region = Region.US_EAST_1; Review Comment: not sure if this is unnecessary overkill. but we could create a S3 client w/ US_EAST_1 and get the bucket location using ``` GetBucketLocationResponse bucketLocationResponse = s3Client.getBucketLocation(GetBucketLocationRequest.builder().bucket(bucketName).build()); String bucketRegion = bucketLocationResponse.locationConstraint().toString(); ``` and then re-instantiate the S3client if region is different. -- This is an automated message from the Apache Git Service. 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