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https://issues.apache.org/jira/browse/BEAM-10706?focusedWorklogId=512774&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-512774
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ASF GitHub Bot logged work on BEAM-10706:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 17/Nov/20 08:20
Start Date: 17/Nov/20 08:20
Worklog Time Spent: 10m
Work Description: dennisylyung commented on pull request #12583:
URL: https://github.com/apache/beam/pull/12583#issuecomment-728767204
@iemejia I have wrote a separate test for the deduplication, using Mockito
to verify the contents submitted to the AWS client. Please check.
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Issue Time Tracking
-------------------
Worklog Id: (was: 512774)
Time Spent: 2.5h (was: 2h 20m)
> DynamoDBIO fail to write to the same key in short consecution
> -------------------------------------------------------------
>
> Key: BEAM-10706
> URL: https://issues.apache.org/jira/browse/BEAM-10706
> Project: Beam
> Issue Type: Bug
> Components: io-java-aws
> Affects Versions: 2.23.0
> Reporter: Dennis Yung
> Priority: P2
> Time Spent: 2.5h
> 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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