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Posted to issues@beam.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2020/08/14 16:15:00 UTC
[jira] [Work logged] (BEAM-10706) DynamoDBIO fail to write to the
same key in short consecution
[ https://issues.apache.org/jira/browse/BEAM-10706?focusedWorklogId=470739&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-470739 ]
ASF GitHub Bot logged work on BEAM-10706:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 14/Aug/20 16:14
Start Date: 14/Aug/20 16:14
Worklog Time Spent: 10m
Work Description: dennisylyung opened a new pull request #12583:
URL: https://github.com/apache/beam/pull/12583
DynamoDBIO.Write will throw a duplicate key error when write requests in the batch contains duplicate keys.
An optional deduplication mechanism is added to avoid this error, taking reference from the implementation in [the official Python SDK of DynamoDB](https://github.com/boto/boto3/blob/develop/boto3/dynamodb/table.py).
Changes to the ver1 module (beam-sdks-java-io-amazon-web-services) has been tested on an actual DynamoDB table with writes with duplicate keys. The job throws duplicate error if overwriteByPKeys are not specified, but ran successfully if the table's partition and sort keys are provided, as expected.
Changes have been ported to the ver2 module (beam-sdks-java-io-amazon-web-services2), but not tested on an actual dynamodb table. It passed local unit tests as did v1.
tests are updated to include provision of overwriteByPKeys, but a dedicated test for duplicate keys has not been written, since the mock dynamodb does not seem to throw on duplicate keys anyhow.
R: @jbonofre @lukecwik @chamikaramj @timrobertson100
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Issue Time Tracking
-------------------
Worklog Id: (was: 470739)
Remaining Estimate: 0h
Time Spent: 10m
> 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
> Assignee: Dennis Yung
> Priority: P2
> Time Spent: 10m
> 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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