DynamoDB java sdk v2 client batchWrite retries

Question

Does the DynamoDB Java SDKv2 offer a retry strategy for batchWriteItem calls? I'm looking for a retry strategy that retries items that would otherwise be returned as unprocessedItems.

In the DynamoDB Java SDKv1 there was the DynamoDBMapper default retry strategy to achieve this, see https://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/com/amazonaws/services/dynamodbv2/datamodeling/DynamoDBMapperConfig.DefaultBatchWriteRetryStrategy.html.

I couldn't find anything related to retries out of the box for batch operations in the official javadoc, e.g. https://sdk.amazonaws.com/java/api/latest/software/amazon/awssdk/services/dynamodb/DynamoDbClient.html#batchWriteItem(java.util.function.Consumer) or https://sdk.amazonaws.com/java/api/latest/software/amazon/awssdk/enhanced/dynamodb/package-summary.html.

I was hoping I don't have to implement retries myself on top of the default or enhanced client.

NeveMore · Accepted Answer · 2024-05-18 10:52:40Z

1

Just ran into this issue a few days ago.

The document suggests a simple loop way now instead of complex retry strategy. And the loop code is simple :)

Document link:

Typically, you would call BatchWriteItem in a loop. Each iteration would check for unprocessed items and submit a new BatchWriteItem request with those unprocessed items until all items have been processed.

And aws also provides code example here

answered May 18, 2024 at 10:52

NeveMore

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3 Comments

yassin Over a year ago

Thank you, looks like this is the recommendation, but in my opinion it also has some drawbacks. I wanted to have exponential backoff, so this already adds some complexity on my side, and code duplication potentially if I need to implement this for more operations.

NeveMore Over a year ago

@yassin looks like we have to do some coding to get exponential backoff working in the Java SDK v2. Seems sometimes DynamoDB isn't very developer-friendly. e.g., I have to deal with the 1MB query limit when trying to get the total count of a table :|

Kohei Nozaki Oct 31 at 5:10

I've raised this in their GitHub repository: github.com/aws/aws-sdk-java-v2/issues/6536

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