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https://issues.apache.org/jira/browse/BEAM-10706?focusedWorklogId=476598&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-476598
]
ASF GitHub Bot logged work on BEAM-10706:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 31/Aug/20 14:30
Start Date: 31/Aug/20 14:30
Worklog Time Spent: 10m
Work Description: dennisylyung commented on a change in pull request
#12583:
URL: https://github.com/apache/beam/pull/12583#discussion_r480169412
##########
File path:
sdks/java/io/amazon-web-services/src/main/java/org/apache/beam/sdk/io/aws/dynamodb/DynamoDBIO.java
##########
@@ -450,12 +459,35 @@ public void startBundle(StartBundleContext context) {
public void processElement(ProcessContext context) throws Exception {
final KV<String, WriteRequest> writeRequest =
(KV<String, WriteRequest>)
spec.getWriteItemMapperFn().apply(context.element());
+ if (spec.getOverwriteByPKeys() != null) {
+ removeDupPKeysRequestsIfAny(writeRequest.getValue());
+ }
batch.add(writeRequest);
if (batch.size() >= BATCH_SIZE) {
flushBatch();
}
}
+ private void removeDupPKeysRequestsIfAny(WriteRequest request) {
Review comment:
I think the later event is more preferred, although Apache beam do not
have strict ordering. Not sure why the AWS Python SDK is implemented this way.
I will try using something like a map.
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Issue Time Tracking
-------------------
Worklog Id: (was: 476598)
Time Spent: 1h 10m (was: 1h)
> 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: 1h 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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