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From "ASF GitHub Bot (Jira)" <>
Subject [jira] [Work logged] (BEAM-10706) DynamoDBIO fail to write to the same key in short consecution
Date Sat, 05 Dec 2020 06:45:00 GMT


ASF GitHub Bot logged work on BEAM-10706:

                Author: ASF GitHub Bot
            Created on: 05/Dec/20 06:44
            Start Date: 05/Dec/20 06:44
    Worklog Time Spent: 10m 
      Work Description: dennisylyung commented on pull request #12583:

   > My excuses @dennisylyung I took a quick look today and it looks mostly ok (I have
some minor things that I can fix) the only issue I have is that I just realized that the tests
are disabled for DynamoDB how did you get them to run? I removed the Ignore annotation and
enabled the specific extra test on this PR but I get a failure.
   I tested also by commenting out the ignore annotation.
   The test itself passes, but `destroy` fails due to this bug
The error is universal to all tests in DynamoDBIOTest, not just the new one.
   I upgraded Localstack to the fixed version and it now passes. (It always passes in aws2)

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Issue Time Tracking

    Worklog Id:     (was: 520440)
    Time Spent: 3h 20m  (was: 3h 10m)

> DynamoDBIO fail to write to the same key in short consecution
> -------------------------------------------------------------
>                 Key: BEAM-10706
>                 URL:
>             Project: Beam
>          Issue Type: Bug
>          Components: io-java-aws
>    Affects Versions: 2.23.0
>            Reporter: Dennis Yung
>            Assignee: Dennis Yung
>            Priority: P2
>             Fix For: 2.27.0
>          Time Spent: 3h 20m
>  Remaining Estimate: 0h
> Internally, DynamoDBIO.Write uses the batchWriteItem method from the AWS SDK to sink
items. However, there is a limitation in the AWS SDK that a call to batchWriteItem cannot
contain duplicate keys.
> Currently DynamoDBIO.Write performs no key deduplication before flushing a batch, which
could cause ValidationException: Provided list of item keys contains duplicates, if consecutive
updates to a single key is within the batch size (currently hardcoded to be 25). 
> To fix this bug, the batch of write requests need to be deduplicated before being sent
to batchRequest.addRequestItemsEntry

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