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https://issues.apache.org/jira/browse/GEODE-7971?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17095506#comment-17095506
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ASF GitHub Bot commented on GEODE-7971:
---------------------------------------
albertogpz commented on pull request #4928:
URL: https://github.com/apache/geode/pull/4928#issuecomment-621255116
> If I do this:
>
> * start site 1 with a sender with batch size = 5
>
> * do a transaction with 1 customer and 10 orders
>
> * don't start site 2 immediately
>
>
> I see behavior like below:
>
> The first call to peek is correct. It returns 11 events.
>
> Since the batch can't be sent, the batch is recreated. This batch only
contains 5 events.
I had not thought about this case.
I have pushed another commit that should solve the issue.
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> Gateway sender to deliver transaction events atomically to gateway receivers
> ----------------------------------------------------------------------------
>
> Key: GEODE-7971
> URL: https://issues.apache.org/jira/browse/GEODE-7971
> Project: Geode
> Issue Type: Improvement
> Components: wan
> Reporter: Alberto Gomez
> Assignee: Alberto Gomez
> Priority: Major
> Time Spent: 50m
> Remaining Estimate: 0h
>
> The goal of this ticket is to implement the necessary changes in the gateway
> sender to prevent that events belonging to the same transaction are spread
> across different batches. In other words, to ensure that events from the same
> transaction are sent inside the same batch.
> This will be an optional feature on gateway senders to be enabled via a new
> parameter (--group-transaction-events) and will be restricted to serial
> gateway senders with just one dispatcher thread or to parallel gateway
> senders.
> Apart from the above restriction, grouping of events for a transaction inside
> the same batch may only be attained if the regions to which the events belong
> are replicated by the same set of gateway senders with the
> --group-transaction-events flag enabled. If this condition is not met, the
> events will be correctly delivered by the gateway senders but it will not be
> guaranteed that all events will always be sent inside the same batch.
> For more details see:
> [https://cwiki.apache.org/confluence/display/GEODE/Gw+sender+to+deliver+transaction+events+atomically+to+receivers]
>
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